Metencephalon hi-res stock photography and images

Central nervous system, artwork Stock Photo

RFD65A5A–Central nervous system, artwork

RFACTHRK–The cerebral nuclei

Embryonic nervous system, illustration Stock Photo

RF2RHTD0E–Embryonic nervous system, illustration

The anatomy of the nervous system, from the standpoint of development and function . he telencephalon and diencephalon with freelyintercommunicating cavities. The mesencephalon is well denned and presentsa sharp bend, the cephalic flexure. The rhombencephalon shows signs of sepa-ration into the metencephalon and myelencephalon and is slightly bent dorsallyat the pontine flexure. Another curvature which develops at the junction of 32 THE NERVOUS SYSTEM the brain and spinal cord is known as the cervical flexure (Fig. 16). Fromthe walls of the prosencephalon there develop outpocketings on either Stock Photo

RM2AWJDJP–The anatomy of the nervous system, from the standpoint of development and function . he telencephalon and diencephalon with freelyintercommunicating cavities. The mesencephalon is well denned and presentsa sharp bend, the cephalic flexure. The rhombencephalon shows signs of sepa-ration into the metencephalon and myelencephalon and is slightly bent dorsallyat the pontine flexure. Another curvature which develops at the junction of 32 THE NERVOUS SYSTEM the brain and spinal cord is known as the cervical flexure (Fig. 16). Fromthe walls of the prosencephalon there develop outpocketings on either

RMBCE62X–A profile of the brain of a human fetus at 10 weeks.

. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 392 THE CEREBELLUM The Development of the Metencephalon and Isthmus.—Our knowl- edge of the development of the metencephalon, isthmus, and mesen- cephalon is by no means as complete as is that of the myelencephalon. The pons develops as a thickening of the portion of the brain floor which forms the anterior wall of the pons flexure, and its transverse fibers are well developed by the fourth month (Mihalkovicz), but all details regarding the origin of the pons nuclei are as yet wanting. If one Stock Photo

RMPFA73G–. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 392 THE CEREBELLUM The Development of the Metencephalon and Isthmus.—Our knowl- edge of the development of the metencephalon, isthmus, and mesen- cephalon is by no means as complete as is that of the myelencephalon. The pons develops as a thickening of the portion of the brain floor which forms the anterior wall of the pons flexure, and its transverse fibers are well developed by the fourth month (Mihalkovicz), but all details regarding the origin of the pons nuclei are as yet wanting. If one

Archive image from page 403 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 392 THE CEREBELLUM The Development of the Metencephalon and Isthmus.—Our knowl- edge of the development of the metencephalon, isthmus, and mesen- cephalon is by no means as complete as is that of the myelencephalon. The pons develops as a thickening of the portion of the brain floor which forms the anterior wall of the pons flexure, and its transverse fibers are well developed by the fourth month (Mihalkovicz), but all details regard Stock Photo

RMW1BHW9–Archive image from page 403 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 392 THE CEREBELLUM The Development of the Metencephalon and Isthmus.—Our knowl- edge of the development of the metencephalon, isthmus, and mesen- cephalon is by no means as complete as is that of the myelencephalon. The pons develops as a thickening of the portion of the brain floor which forms the anterior wall of the pons flexure, and its transverse fibers are well developed by the fourth month (Mihalkovicz), but all details regard

. The elasmobranch fishes . Fig. 201. Cross-section of cord, Hep- tanchus cinereus. (From Sterzi.) (Grey matter stippled.) d.h., dorsal horn; v.h., ventral horn. the mesencephalon and near the cerebellnm the fourth cranial or trochlear nerve arises {IV). Ventrally the mesensephalon is composed of large fiber tracts through which the third cranial or oculomotor nerve (7/7) emerges and passes forward to muscles of the eye. The metencephalon consists, in large part, of the cerebellum (c6.), a large shield-shaped mass, separated dorsally into right and left halves by a median groove. The cerebellu Stock Photo

RMMA7C4P–. The elasmobranch fishes . Fig. 201. Cross-section of cord, Hep- tanchus cinereus. (From Sterzi.) (Grey matter stippled.) d.h., dorsal horn; v.h., ventral horn. the mesencephalon and near the cerebellnm the fourth cranial or trochlear nerve arises {IV). Ventrally the mesensephalon is composed of large fiber tracts through which the third cranial or oculomotor nerve (7/7) emerges and passes forward to muscles of the eye. The metencephalon consists, in large part, of the cerebellum (c6.), a large shield-shaped mass, separated dorsally into right and left halves by a median groove. The cerebellu

RFACJ0TH–The human brain

The anatomy of the nervous system, from the standpoint of development and function . *-Tkird ventricle) Diencephalon MesoceeleV Mesencephalon I VMetaccele / Metencephalon Cerebellum(caudal part) Rhomboid fossaMyelencephalon Fig. 8.—The brain of the dogfish,Squalus acanthias, dorsal view. Fig. 9.—The brain of the dogfish,Squalus acanthias, with the ventriclesopened, dorsal view. (Fig. 8). Its dorsal surface is grooved by a pair of sulci arranged in the formof a cross. It contains a cavity, a part of the original rhombencephalic vesicle,which communicates with the fourth ventricle proper throug Stock Photo

RM2AWJHJW–The anatomy of the nervous system, from the standpoint of development and function . *-Tkird ventricle) Diencephalon MesoceeleV Mesencephalon I VMetaccele / Metencephalon Cerebellum(caudal part) Rhomboid fossaMyelencephalon Fig. 8.—The brain of the dogfish,Squalus acanthias, dorsal view. Fig. 9.—The brain of the dogfish,Squalus acanthias, with the ventriclesopened, dorsal view. (Fig. 8). Its dorsal surface is grooved by a pair of sulci arranged in the formof a cross. It contains a cavity, a part of the original rhombencephalic vesicle,which communicates with the fourth ventricle proper throug

Sagittal section of the human brain, showing structures of the cerebellum, brainstem, and cerebral ventricles. Stock Photo

RMBCE641–Sagittal section of the human brain, showing structures of the cerebellum, brainstem, and cerebral ventricles.

. Zoology : for students and general readers . Zoology. Mid brain. NEBVOUa SYSTEM OF VERTEBRATES. 393 {Optic lobes, corpora bigemlna or qaadrigemina (tnesen- cepbalon). Crura cerebri. Optic ventricle or Iter a tertio ad quartum ventriculum. Hind brain. Cerebellum (with its ventricle and the pons varolii, form- ing the metencephalon). Medulla oblongata and fourth ventricle. The accompanying sketches represent the typical nervous system of an amphibian, -which also resembles that of many fishes, and even the lower Reptilia. The spinal cord (Fig. 374) usually extends through the whole length of t Stock Photo

RMPG0JRW–. Zoology : for students and general readers . Zoology. Mid brain. NEBVOUa SYSTEM OF VERTEBRATES. 393 {Optic lobes, corpora bigemlna or qaadrigemina (tnesen- cepbalon). Crura cerebri. Optic ventricle or Iter a tertio ad quartum ventriculum. Hind brain. Cerebellum (with its ventricle and the pons varolii, form- ing the metencephalon). Medulla oblongata and fourth ventricle. The accompanying sketches represent the typical nervous system of an amphibian, -which also resembles that of many fishes, and even the lower Reptilia. The spinal cord (Fig. 374) usually extends through the whole length of t

Archive image from page 215 of Die Anatomie des Frosches; ein. Die Anatomie des Frosches; ein Handbuch fÃ¼r Physiologen, Ãrzte und Studire . dieanatomiedesfr0102ecke Year: 1887- 44 Bau fies Metencephalon und Isthmus i'hombencepliali. StructurdesCerebellum. Die Cerebellarplatte stellt nur den aufgerichteten und verdickten vorderen Abschnitt der Decke des vierten Ventrikels dar, der jedoch eine besondere Structur erlangt hat. Die Platte lässt sechs, in caudo-cranialer Richtung auf ein- ander folgende Schichten unterscheiden. Diese stellen aber nicht einfach frontal stehende Platten dar, sondern Stock Photo

RMW1659A–Archive image from page 215 of Die Anatomie des Frosches; ein. Die Anatomie des Frosches; ein Handbuch fÃ¼r Physiologen, Ãrzte und Studire . dieanatomiedesfr0102ecke Year: 1887- 44 Bau fies Metencephalon und Isthmus i'hombencepliali. StructurdesCerebellum. Die Cerebellarplatte stellt nur den aufgerichteten und verdickten vorderen Abschnitt der Decke des vierten Ventrikels dar, der jedoch eine besondere Structur erlangt hat. Die Platte lässt sechs, in caudo-cranialer Richtung auf ein- ander folgende Schichten unterscheiden. Diese stellen aber nicht einfach frontal stehende Platten dar, sondern

. Die Anatomie des Frosches; ein Handbuch fÃ¼r Physiologen, Ãrzte und Studire . Regio subcerebellaris Ventralhom-Best. Fase long. med. QuerBchnitt durch das Metencephalon, vor dem Trigeminusaustritt. Schematisirt. Vergr. 15 mal. hineinragt (Fig. 15). — Die allgemeine Anordnung der Massen in der Begio subcerebellaris und in den ventral - lateralen Theilen des Isthmus gleicht noch der in der Medulla obloncjata; die Cerebellarplatte und das Velum medulläre anterius besitzen ihre eigene Structur. Stock Photo

RMMEJT5E–. Die Anatomie des Frosches; ein Handbuch fÃ¼r Physiologen, Ãrzte und Studire . Regio subcerebellaris Ventralhom-Best. Fase long. med. QuerBchnitt durch das Metencephalon, vor dem Trigeminusaustritt. Schematisirt. Vergr. 15 mal. hineinragt (Fig. 15). — Die allgemeine Anordnung der Massen in der Begio subcerebellaris und in den ventral - lateralen Theilen des Isthmus gleicht noch der in der Medulla obloncjata; die Cerebellarplatte und das Velum medulläre anterius besitzen ihre eigene Structur.

RFACWGWX–The brainstem

A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . ephalon( fore ? brain) Rhombencephalon. Medulla oblongata. Myelencephalon. Pars facialis medulte.Metencephalon. Cerebellum. Pons. Development.—The form of the human brainat the end of the first month of intrauterinelife is shown in Fig. 886, and the subdivisionsof the brain at this age, as defined by His,are indicated in Fig. 887. The arrangementof the priman,- longitudinal columns in themedulla oblongata of an erabrj-o of about thesame age is seen in Fig. 888, whe Stock Photo

RM2AKBKNM–A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . ephalon( fore ? brain) Rhombencephalon. Medulla oblongata. Myelencephalon. Pars facialis medulte.Metencephalon. Cerebellum. Pons. Development.—The form of the human brainat the end of the first month of intrauterinelife is shown in Fig. 886, and the subdivisionsof the brain at this age, as defined by His,are indicated in Fig. 887. The arrangementof the priman,- longitudinal columns in themedulla oblongata of an erabrj-o of about thesame age is seen in Fig. 888, whe

. Der Frosch; zugleich eine Einf in das praktische Studium des Wirbeltier-Krs. Frogs. — 31 — fortsetzen, welche von einer darüberziehenden dünnen blutgefäßreichen Haut, der Tela chorioidea überdeckt ist. Auf das Nachhirn folgt nach vorn zu das Metencephalon, dessen ventraler Teil sich äußerlich nicht von den davor- und dahinterliegenden Gehirnabschnitten unterscheidet, während sein dorsaler Teil, das Cere- b eil um, als eine schmale quergestellte Platte die Rautengrube rostal ab- schließt. Fig. 15. b. N. olfaotorius -f/W/ Lobus olfaotorius Großhirn Zwischenhirn (median die Zirbel- drüse) Mitte Stock Photo

RMPFBR5X–. Der Frosch; zugleich eine Einf in das praktische Studium des Wirbeltier-Krs. Frogs. — 31 — fortsetzen, welche von einer darüberziehenden dünnen blutgefäßreichen Haut, der Tela chorioidea überdeckt ist. Auf das Nachhirn folgt nach vorn zu das Metencephalon, dessen ventraler Teil sich äußerlich nicht von den davor- und dahinterliegenden Gehirnabschnitten unterscheidet, während sein dorsaler Teil, das Cere- b eil um, als eine schmale quergestellte Platte die Rautengrube rostal ab- schließt. Fig. 15. b. N. olfaotorius -f/W/ Lobus olfaotorius Großhirn Zwischenhirn (median die Zirbel- drüse) Mitte

Archive image from page 214 of Die Anatomie des Frosches; ein. Die Anatomie des Frosches; ein Handbuch fÃ¼r Physiologen, Ãrzte und Studire . dieanatomiedesfr0102ecke Year: 1887- Hau des Metencephalon und Isthmus i-homboncephali. 43 beiden Hälften der Querschnitt des Ventrikels. Er ist flach und besitzt im Ganzen die Form eines niedrigen Rhombus, doch ist jederseits vom Sulcus centralis der ganze Boden, und jederseits von der dorsalen Spitze die mediale Ausstiahhiug des Acusticusfekles Fig. 14. V, Kad. mot. Tract. cerebello- spJD. Cerebellum Str;it. granul. Acusticusgrau Aciisticiisfeld (Fa Stock Photo

RMW16568–Archive image from page 214 of Die Anatomie des Frosches; ein. Die Anatomie des Frosches; ein Handbuch fÃ¼r Physiologen, Ãrzte und Studire . dieanatomiedesfr0102ecke Year: 1887- Hau des Metencephalon und Isthmus i-homboncephali. 43 beiden Hälften der Querschnitt des Ventrikels. Er ist flach und besitzt im Ganzen die Form eines niedrigen Rhombus, doch ist jederseits vom Sulcus centralis der ganze Boden, und jederseits von der dorsalen Spitze die mediale Ausstiahhiug des Acusticusfekles Fig. 14. V, Kad. mot. Tract. cerebello- spJD. Cerebellum Str;it. granul. Acusticusgrau Aciisticiisfeld (Fa

. Die anatomische Nomenclatur. Nomina anatomica, Verzeichniss der von der anatomischen Gesellschaft auf ihrer IX. Versammlung in Basel angenommenen Namen . Fig. 17. Medianschnitt durch eiu menschliches Embryonenhirn vom Ende des ersten Monats mit eingezeichneten Feldern. I. Myelencephalon: l. 1. Pars ventralis. I. 2. Pars dorsalis. IL 1. Pons. II. Metencephalon: II. 2. Cerebellum. III. Isthmus: III. 1. Pedunculi cerebri. III. 2. Brachia conjunctiva, Vel. med. ant. IV, Mesencephalon: IV. 1. Pedunculi cerebri. IV. 2. Corpora quadrigemina. V. Diencephalon: V. 1, Pars mamillaris hypothalami. V. 2. Stock Photo

RMMEJWG5–. Die anatomische Nomenclatur. Nomina anatomica, Verzeichniss der von der anatomischen Gesellschaft auf ihrer IX. Versammlung in Basel angenommenen Namen . Fig. 17. Medianschnitt durch eiu menschliches Embryonenhirn vom Ende des ersten Monats mit eingezeichneten Feldern. I. Myelencephalon: l. 1. Pars ventralis. I. 2. Pars dorsalis. IL 1. Pons. II. Metencephalon: II. 2. Cerebellum. III. Isthmus: III. 1. Pedunculi cerebri. III. 2. Brachia conjunctiva, Vel. med. ant. IV, Mesencephalon: IV. 1. Pedunculi cerebri. IV. 2. Corpora quadrigemina. V. Diencephalon: V. 1, Pars mamillaris hypothalami. V. 2.

RFACWHJT–The brainstem

The anatomy of the nervous system, from the standpoint of development and function . ch is differentiated from the ventral part of the metencephalon,is interposed between the medulla oblongata and the cerebral peduncles andlies ventral to the cerebellum. As seen from the ventral surface, it is formedby a broad transverse band of nerve-fibers, which on either side become aggre-gated into a large rounded strand, the brae hi urn ponds or middle cerebellar 124 THE NERVOUS SYSTEM peduncle, and finally enter the corresponding hemisphere of the cerebellum(Figs. 83, 86). This transverse band of fibers Stock Photo

RM2AWH3F5–The anatomy of the nervous system, from the standpoint of development and function . ch is differentiated from the ventral part of the metencephalon,is interposed between the medulla oblongata and the cerebral peduncles andlies ventral to the cerebellum. As seen from the ventral surface, it is formedby a broad transverse band of nerve-fibers, which on either side become aggre-gated into a large rounded strand, the brae hi urn ponds or middle cerebellar 124 THE NERVOUS SYSTEM peduncle, and finally enter the corresponding hemisphere of the cerebellum(Figs. 83, 86). This transverse band of fibers

The elasmobranch fishes . elasmobranchfish03dani Year: 1934 IX NERVOUS SYSTEM NERVOUS SYSTEM OF HEPTANCHUS MACULATUS Central Nervous System BRAIN The brain of Heptanchus maculatiis may be described as made up of five divisions, as is common for the Elasmobranchs. These divisions, beginning anteriorly are: the telencephalon, the diencephalon. the mesencephalon, the metencephalon, and the mj^elencephalon. The telencephalon (//., fig. 200a ), if seen from the dorsal side, appears as a bilobed mass which is continued forward by long olfactory tracts (ol.t.). Between the tracts and projecting slig Stock Photo

RMT03PX9–The elasmobranch fishes . elasmobranchfish03dani Year: 1934 IX NERVOUS SYSTEM NERVOUS SYSTEM OF HEPTANCHUS MACULATUS Central Nervous System BRAIN The brain of Heptanchus maculatiis may be described as made up of five divisions, as is common for the Elasmobranchs. These divisions, beginning anteriorly are: the telencephalon, the diencephalon. the mesencephalon, the metencephalon, and the mj^elencephalon. The telencephalon (//., fig. 200a ), if seen from the dorsal side, appears as a bilobed mass which is continued forward by long olfactory tracts (ol.t.). Between the tracts and projecting slig

RFACTM3X–The brainstem

The anatomy of the nervous system, from the standpoint of development and function . Telencephalon -Vagus nerve N. X.--Spinal cord-—. *-Tkird ventricle) Diencephalon MesoceeleV Mesencephalon I VMetaccele / Metencephalon Cerebellum(caudal part) Rhomboid fossaMyelencephalon Fig. 8.—The brain of the dogfish,Squalus acanthias, dorsal view. Fig. 9.—The brain of the dogfish,Squalus acanthias, with the ventriclesopened, dorsal view. (Fig. 8). Its dorsal surface is grooved by a pair of sulci arranged in the formof a cross. It contains a cavity, a part of the original rhombencephalic vesicle,which com Stock Photo

RM2AWJJ2W–The anatomy of the nervous system, from the standpoint of development and function . Telencephalon -Vagus nerve N. X.--Spinal cord-—. *-Tkird ventricle) Diencephalon MesoceeleV Mesencephalon I VMetaccele / Metencephalon Cerebellum(caudal part) Rhomboid fossaMyelencephalon Fig. 8.—The brain of the dogfish,Squalus acanthias, dorsal view. Fig. 9.—The brain of the dogfish,Squalus acanthias, with the ventriclesopened, dorsal view. (Fig. 8). Its dorsal surface is grooved by a pair of sulci arranged in the formof a cross. It contains a cavity, a part of the original rhombencephalic vesicle,which com

The elasmobranch fishes (1934) The elasmobranch fishes elasmobranchfish03dani Year: 1934 IX NERVOUS SYSTEM NERVOUS SYSTEM OF HEPTANCHUS MACULATUS Central Nervous System BRAIN The brain of Heptanchus maculatiis may be described as made up of five divisions, as is common for the Elasmobranchs. These divisions, beginning anteriorly are: the telencephalon, the diencephalon. the mesencephalon, the metencephalon, and the mj^elencephalon. The telencephalon (//., fig. 200a ), if seen from the dorsal side, appears as a bilobed mass which is continued forward by long olfactory tracts (ol.t.). Between t Stock Photo

RMRWTA4J–The elasmobranch fishes (1934) The elasmobranch fishes elasmobranchfish03dani Year: 1934 IX NERVOUS SYSTEM NERVOUS SYSTEM OF HEPTANCHUS MACULATUS Central Nervous System BRAIN The brain of Heptanchus maculatiis may be described as made up of five divisions, as is common for the Elasmobranchs. These divisions, beginning anteriorly are: the telencephalon, the diencephalon. the mesencephalon, the metencephalon, and the mj^elencephalon. The telencephalon (//., fig. 200a ), if seen from the dorsal side, appears as a bilobed mass which is continued forward by long olfactory tracts (ol.t.). Between t

RFACW7PM–The brainstem

A treatise on zoology . he Craniate is subdivided into primaryfore-brain, mid-brain, and hind-brain. Later on the hind-brain forms a posterior myelencephalon ormedulla oblongata, and an anterior metencephalon, giving riseabove to the cerebellum (Figs. 7, 8, 9, and 10). The hind-brain is 1 Authors differ on this debatable point. Some place the anterior eud of thebrain at the infuudibulum, others at the edge of the ueiiropore. Johnston [248a]believes it to lie at a point just behind the anterior commissure, and in front of theoptic recess and chiasma. 14 BRAIN the least modified part; it resembl Stock Photo

RM2AJDJC5–A treatise on zoology . he Craniate is subdivided into primaryfore-brain, mid-brain, and hind-brain. Later on the hind-brain forms a posterior myelencephalon ormedulla oblongata, and an anterior metencephalon, giving riseabove to the cerebellum (Figs. 7, 8, 9, and 10). The hind-brain is 1 Authors differ on this debatable point. Some place the anterior eud of thebrain at the infuudibulum, others at the edge of the ueiiropore. Johnston [248a]believes it to lie at a point just behind the anterior commissure, and in front of theoptic recess and chiasma. 14 BRAIN the least modified part; it resembl

Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 fig. 284. Brain of a Ckelonian (after Bojanus). B Of a Bird. Vertical median sections. I Prosencephalon. Ill Mesencephalon. IV Metencephalon. V Myelen- cephalon. ol Olfactory, o Optic nerve, h Hypophysis, a (in A) connection between the two hemispheres of the mesencephalon, c Anterior commissure. This condition connects theReptilia with the Aves, which are distin- guished by the great proportionate size of their prosencephalon, the hemispheres of which are often greatly broadened out. They Stock Photo

RMRWX1WJ–Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 fig. 284. Brain of a Ckelonian (after Bojanus). B Of a Bird. Vertical median sections. I Prosencephalon. Ill Mesencephalon. IV Metencephalon. V Myelen- cephalon. ol Olfactory, o Optic nerve, h Hypophysis, a (in A) connection between the two hemispheres of the mesencephalon, c Anterior commissure. This condition connects theReptilia with the Aves, which are distin- guished by the great proportionate size of their prosencephalon, the hemispheres of which are often greatly broadened out. They

RFACWGKN–The brainstem

. Journal of comparative neurology . ^ invaginated. So in this case, we A CASE OF CYCLOPIATh. 237. Fig. 21 A Medial sagittal section of a His model of the brain at the end ofthe fourth week (modified from Spalteholz). C.st., corpus striatum; 1st., isthmus;Mes., mesencephalon; Met., metencephalon; Myel., myelencephalon; Pal., pal-lium; P.m.th., pars mamillaris hypothalami: P.o.th., pars optica hypothalami;Rh., rhinencephalon; S.Lim., sulcus limitans; Th., thalamus. Fig. 21 B Right half of a His model of the brain at end of fourth week, fromwhich the anlagen of the rhinencephalon, corpus striatu Stock Photo

RM2CDAY2D–. Journal of comparative neurology . ^ invaginated. So in this case, we A CASE OF CYCLOPIATh. 237. Fig. 21 A Medial sagittal section of a His model of the brain at the end ofthe fourth week (modified from Spalteholz). C.st., corpus striatum; 1st., isthmus;Mes., mesencephalon; Met., metencephalon; Myel., myelencephalon; Pal., pal-lium; P.m.th., pars mamillaris hypothalami: P.o.th., pars optica hypothalami;Rh., rhinencephalon; S.Lim., sulcus limitans; Th., thalamus. Fig. 21 B Right half of a His model of the brain at end of fourth week, fromwhich the anlagen of the rhinencephalon, corpus striatu

RMRWX1WP–Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 fig. 284. Brain of a Ckelonian (after Bojanus). B Of a Bird. Vertical median sections. I Prosencephalon. Ill Mesencephalon. IV Metencephalon. V Myelen- cephalon. ol Olfactory, o Optic nerve, h Hypophysis, a (in A) connection between the two hemispheres of the mesencephalon, c Anterior commissure. This condition connects theReptilia with the Aves, which are distin- guished by the great proportionate size of their prosencephalon, the hemispheres of which are often greatly broadened out. They

RFACTNNG–Cerebral arteries

. The chordates. Chordata. CEPHALIC FLEXURE DIENCEPHALON TELENCEPHALON. FOREBRAIN OPTIC VESICLE OLFACTORY LOBE II MIDBRAIN INFUND CEREBELLUM. MESENCEPHALON EPIPHYSIS DIENCEPHALON- TELENCEPHALON METENCEPHALON « TELENCEPHALON. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston Stock Photo

RMRJ5M0K–. The chordates. Chordata. CEPHALIC FLEXURE DIENCEPHALON TELENCEPHALON. FOREBRAIN OPTIC VESICLE OLFACTORY LOBE II MIDBRAIN INFUND CEREBELLUM. MESENCEPHALON EPIPHYSIS DIENCEPHALON- TELENCEPHALON METENCEPHALON « TELENCEPHALON. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston

Elements of Comparative Anatomy (1878) Elements of Comparative Anatomy elementsofcompar78gege Year: 1878 Fig. 284. Brain of a Chelonian (after Bojanus). B Of a Bird. Vertical median sections. I Prosencephalon. 711 Mesencephalon. IV Metencephalon. V Myelen- cephalon. ol Olfactory, o Optic nerve, h Hypophysis, a (in A) connection between the two hemisjjheres of the mesencephalon, c Anterior commissure. This condition connects theReptilia with the Aves, which are distin- guished by the great proportionate size of their prosencephalon, the hemispheres of which are often greatly broadened out. The Stock Photo

RMRWTKFJ–Elements of Comparative Anatomy (1878) Elements of Comparative Anatomy elementsofcompar78gege Year: 1878 Fig. 284. Brain of a Chelonian (after Bojanus). B Of a Bird. Vertical median sections. I Prosencephalon. 711 Mesencephalon. IV Metencephalon. V Myelen- cephalon. ol Olfactory, o Optic nerve, h Hypophysis, a (in A) connection between the two hemisjjheres of the mesencephalon, c Anterior commissure. This condition connects theReptilia with the Aves, which are distin- guished by the great proportionate size of their prosencephalon, the hemispheres of which are often greatly broadened out. The

RFACTH5Y–The brain

. Chordate anatomy. Chordata; Anatomy, Comparative. 350 CHORDATE ANATOMY Instead of only two brain divisions, cyclostomes have five, telencephalon, diencephalon, mesencephalon, metencephalon, and myelencephalon. Ontogenesis reveals, however, that these five vesicles of cyclostomes and higher vertebrates develop from the original three which are correlated with the three major senses, smell, sight, and hearing. The primitive fore-brain, which in the opinion of most morphologists corresponds to TELEN- MYELENCEPHAUON epiphysis' parietal organ habenular ganglion dorsal sac' paraphysis Monroe's for Stock Photo

RMRJ50DE–. Chordate anatomy. Chordata; Anatomy, Comparative. 350 CHORDATE ANATOMY Instead of only two brain divisions, cyclostomes have five, telencephalon, diencephalon, mesencephalon, metencephalon, and myelencephalon. Ontogenesis reveals, however, that these five vesicles of cyclostomes and higher vertebrates develop from the original three which are correlated with the three major senses, smell, sight, and hearing. The primitive fore-brain, which in the opinion of most morphologists corresponds to TELEN- MYELENCEPHAUON epiphysis' parietal organ habenular ganglion dorsal sac' paraphysis Monroe's for

Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 Fig. 282. Brain of Polypterus bichir. A From above. B From the side. C From below, h Lobi olfactorii. g Prosencephalon. / Thalamencephalon. d Mesencephalon, be Metencephalon. a Myelencephalon (medulla oblongata), ol N. olfactorius. o N. opticus (after J. Miiller). large. This transverse la- mella appears to correspond to the cerebellum of the higher Verte- brata, while the base and sides of the sinus are formed by the myel- encephalon (medulla oblongata). As we pass from the Selachii to th Stock Photo

RMRWX1R5–Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 Fig. 282. Brain of Polypterus bichir. A From above. B From the side. C From below, h Lobi olfactorii. g Prosencephalon. / Thalamencephalon. d Mesencephalon, be Metencephalon. a Myelencephalon (medulla oblongata), ol N. olfactorius. o N. opticus (after J. Miiller). large. This transverse la- mella appears to correspond to the cerebellum of the higher Verte- brata, while the base and sides of the sinus are formed by the myel- encephalon (medulla oblongata). As we pass from the Selachii to th

RFACTPFH–The brain

. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. TELENCEPHALON DIENCEPHALON MESENCEPHALON METENCEPHALON ELENCEPHALON. PREMUSCLE OF STERNOMASTOIO AND TRAPEZIUS MUSCLES OF SHOULDER AREA I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Nelsen, Olin E. (Olin Everett), b. 1898. New York, Blakiston Stock Photo

RMREER1M–. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. TELENCEPHALON DIENCEPHALON MESENCEPHALON METENCEPHALON ELENCEPHALON. PREMUSCLE OF STERNOMASTOIO AND TRAPEZIUS MUSCLES OF SHOULDER AREA I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Nelsen, Olin E. (Olin Everett), b. 1898. New York, Blakiston

Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 Lol r L. FIG. 114.—BRAIN OF PERCH (Perm srhractser). (Side view.) Jt I FIG. 115.—BRAIN OF Perca schractser. (Dorsal view.) Lol, olfactory lobe ; VH, basal part of prosencephalon ; ZH, thalamencephalon ; MH, mesencephalon ; HH, metencephalon ; NH, myelencephalon ; R, spinal cord ; /, olfactory nerve ; //, optic chiasma ; V, trigeminal; UL, lobi inferiores ; Se, central sulcus at the bottom of the sinus rhomboidalis ; Lp, lateral elevations of the cerebellum (lobi posterio Stock Photo

RMRWPT0R–Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 Lol r L. FIG. 114.—BRAIN OF PERCH (Perm srhractser). (Side view.) Jt I FIG. 115.—BRAIN OF Perca schractser. (Dorsal view.) Lol, olfactory lobe ; VH, basal part of prosencephalon ; ZH, thalamencephalon ; MH, mesencephalon ; HH, metencephalon ; NH, myelencephalon ; R, spinal cord ; /, olfactory nerve ; //, optic chiasma ; V, trigeminal; UL, lobi inferiores ; Se, central sulcus at the bottom of the sinus rhomboidalis ; Lp, lateral elevations of the cerebellum (lobi posterio

RFACTJWK–The brain

. The elasmobranch fishes. Chondrichthyes. IX NERVOUS SYSTEM NERVOUS SYSTEM OF HEPTANCHUS MACULATUS Central Nervous System BRAIN The brain of Heptanchus maculatiis may be described as made up of five divisions, as is common for the Elasmobranchs. These divisions, beginning anteriorly are: the telencephalon, the diencephalon. the mesencephalon, the metencephalon, and the mj^elencephalon. The telencephalon (//., fig. 200a ), if seen from the dorsal side, appears as a bilobed mass which is continued forward by long olfactory tracts (ol.t.). Between the tracts and projecting slightly anteriorly is Stock Photo

RMRD7GXX–. The elasmobranch fishes. Chondrichthyes. IX NERVOUS SYSTEM NERVOUS SYSTEM OF HEPTANCHUS MACULATUS Central Nervous System BRAIN The brain of Heptanchus maculatiis may be described as made up of five divisions, as is common for the Elasmobranchs. These divisions, beginning anteriorly are: the telencephalon, the diencephalon. the mesencephalon, the metencephalon, and the mj^elencephalon. The telencephalon (//., fig. 200a ), if seen from the dorsal side, appears as a bilobed mass which is continued forward by long olfactory tracts (ol.t.). Between the tracts and projecting slightly anteriorly is

Archive image from page 136 of Die Säugetiere Einführung in die Die SÃ¤ugetiere. EinfÃ¼hrung in die Anatomie und Systematik der recenten und fossilen Mammalia diesugetiereei00webeuoft Year: 1904 1. Gehini und Kiiokeumark. 119 oder als vierter bekannt ist. Boden und SeitenwÃ¤nde liefern kaudal ver- schiedene StrÃ¤nge, die als Fortsetzung der StrÃ¤nge des RÃ¼ckenmarks er- scheinen. Sie charakterisieren die eigentliche Medulla oblongata gegenÃ¼ber dem Metencephalon, dessen Boden der Pons 'aroli bildet. Diese âIhÃ¼cke' (luerverlaufender Neivenfasern gewinnt namentlich aber erst bei JKiheren SÃ¤ Stock Photo

RMT234X4–Archive image from page 136 of Die Säugetiere Einführung in die Die SÃ¤ugetiere. EinfÃ¼hrung in die Anatomie und Systematik der recenten und fossilen Mammalia diesugetiereei00webeuoft Year: 1904 1. Gehini und Kiiokeumark. 119 oder als vierter bekannt ist. Boden und SeitenwÃ¤nde liefern kaudal ver- schiedene StrÃ¤nge, die als Fortsetzung der StrÃ¤nge des RÃ¼ckenmarks er- scheinen. Sie charakterisieren die eigentliche Medulla oblongata gegenÃ¼ber dem Metencephalon, dessen Boden der Pons 'aroli bildet. Diese âIhÃ¼cke' (luerverlaufender Neivenfasern gewinnt namentlich aber erst bei JKiheren SÃ¤

RFACTGAM–The brain

. A laboratory manual and text-book of embryology. Embryology. 330 THE MORPHOGENESIS OF THE CENTRAL NERVOUS SYSTEM THE DERIVATIVES OF THE NEURAL TUBE Primary Vesicles Subdivisions Derivatives Cavities Telencephalon Cerebral cortex Corpora striata Rhinencephalon Lateral ventricles Cranial portion of third ventricles Prosencephalon Diencephalon Epithalamus (pineal body) Thalamus Optic tract Hypothalamus hypophysis tuber cinereum mammillare bodies Third ventricle Mesencephalon Mesencephalon Corpora quadrigemina Tegmentum Crura cerebri Aquaeductus cerebri Rhombencephalon Metencephalon Cerebellum P Stock Photo

RMRE05BJ–. A laboratory manual and text-book of embryology. Embryology. 330 THE MORPHOGENESIS OF THE CENTRAL NERVOUS SYSTEM THE DERIVATIVES OF THE NEURAL TUBE Primary Vesicles Subdivisions Derivatives Cavities Telencephalon Cerebral cortex Corpora striata Rhinencephalon Lateral ventricles Cranial portion of third ventricles Prosencephalon Diencephalon Epithalamus (pineal body) Thalamus Optic tract Hypothalamus hypophysis tuber cinereum mammillare bodies Third ventricle Mesencephalon Mesencephalon Corpora quadrigemina Tegmentum Crura cerebri Aquaeductus cerebri Rhombencephalon Metencephalon Cerebellum P

RFACWF3X–The cerebellum

. Chordate anatomy. Chordata; Anatomy, Comparative. CEPHALIC FLEXURE DIENCEPHALON TELENCEPHALON I. FOREBRAIN ^ CEREBELLUM OPTIC VESICLE OLFACTORY LOBE. IKIFUNOIBULUM MAMMILLARY BODY OTIC CAPSULE MESENCEPHALON EPIPHYSIS DIENCEPHALON TELENCEPHALON METENCEPHALON YELENCEPHALON. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphi Stock Photo

RMRJ4YX8–. Chordate anatomy. Chordata; Anatomy, Comparative. CEPHALIC FLEXURE DIENCEPHALON TELENCEPHALON I. FOREBRAIN ^ CEREBELLUM OPTIC VESICLE OLFACTORY LOBE. IKIFUNOIBULUM MAMMILLARY BODY OTIC CAPSULE MESENCEPHALON EPIPHYSIS DIENCEPHALON TELENCEPHALON METENCEPHALON YELENCEPHALON. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphi

RFACTJ8T–The brain

. Comparative anatomy. Anatomy, Comparative. 5IO COMPARATIVE ANATOMY the brain, the posterior commissure, marks the boundary between dien- cephalon and mesencephalon. A dorsal commissure in the roof of the midbrain connects the optic lobes. In addition to the commissures, the fibers of two cranial nerves, to optic and the trochlearis, cross the median plane to form chiasmas. The optic chiasma is ventral and just anterior to the infundibulum. The trochlearis chiasma, which occurs in all vertebrates except cyclostomes, lies in the dorsal constriction which separates mes- and metencephalon. CENTR Stock Photo

RMREERAW–. Comparative anatomy. Anatomy, Comparative. 5IO COMPARATIVE ANATOMY the brain, the posterior commissure, marks the boundary between dien- cephalon and mesencephalon. A dorsal commissure in the roof of the midbrain connects the optic lobes. In addition to the commissures, the fibers of two cranial nerves, to optic and the trochlearis, cross the median plane to form chiasmas. The optic chiasma is ventral and just anterior to the infundibulum. The trochlearis chiasma, which occurs in all vertebrates except cyclostomes, lies in the dorsal constriction which separates mes- and metencephalon. CENTR

RFACTKFR–The brain

. The brain from ape to man; a contribution to the study of the evolution and development of the human brain. Brain; Evolution; Pongidae. RECONSTRUCTION OF TARSIUS SPECTRUM 139 continue along the lateral surface of the medulla oblongata, present a definite constriction in the lower portion of the metencephalon, the waist of the trigeminal nucleus. Thev then extend somewhat dorsailv and still further. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly rese Stock Photo

RMRH7XK3–. The brain from ape to man; a contribution to the study of the evolution and development of the human brain. Brain; Evolution; Pongidae. RECONSTRUCTION OF TARSIUS SPECTRUM 139 continue along the lateral surface of the medulla oblongata, present a definite constriction in the lower portion of the metencephalon, the waist of the trigeminal nucleus. Thev then extend somewhat dorsailv and still further. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly rese

RFACTMXW–The brainstem

. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. THE HIND-BRAIN VESICLE OR METENCEPHALON. 293 The lateral parts of the primary ridge increase in size and eventually, in the human brain, outstrip the median lobe in growth. They acquire their chief transverse fissures in the fourth or fifth month, and the smaller sulci later. The thickened cerebellar ridge on the roof of the hind- brain vesicle being continuous with the lateral walls, the continuity of the cerebellar hemispheres with the pons through the middle and superior cerebellar peduncles Stock Photo

RMRJNB3A–. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. THE HIND-BRAIN VESICLE OR METENCEPHALON. 293 The lateral parts of the primary ridge increase in size and eventually, in the human brain, outstrip the median lobe in growth. They acquire their chief transverse fissures in the fourth or fifth month, and the smaller sulci later. The thickened cerebellar ridge on the roof of the hind- brain vesicle being continuous with the lateral walls, the continuity of the cerebellar hemispheres with the pons through the middle and superior cerebellar peduncles

RFACTK8P–The brain

. A laboratory manual and text-book of embryology. Embryology. IOO THE STUDY OF SIX AND TEN MILLIMETER PIG EMBRYOS cervical sinus (see Fig. 88). The brain is differentiated into the five regions, telencephalon, dicnccphalon, â mesencephalon, metencephalon and myelencephalon. The spinal cord is cylindrical and gradually tapers off to the tail. The anlages of the cerebral and spinal ganglia and the main nerve trunks are shown. The oculomotor nerve begins to appear from the ventral wall of the mesencephalon. Ventrodateral to the metencephalon and myelencephalon occur in order the Sup. gang. n. p Stock Photo

RMRE079T–. A laboratory manual and text-book of embryology. Embryology. IOO THE STUDY OF SIX AND TEN MILLIMETER PIG EMBRYOS cervical sinus (see Fig. 88). The brain is differentiated into the five regions, telencephalon, dicnccphalon, â mesencephalon, metencephalon and myelencephalon. The spinal cord is cylindrical and gradually tapers off to the tail. The anlages of the cerebral and spinal ganglia and the main nerve trunks are shown. The oculomotor nerve begins to appear from the ventral wall of the mesencephalon. Ventrodateral to the metencephalon and myelencephalon occur in order the Sup. gang. n. p

RFACWHAM–The brainstem

. Zoology for high schools and colleges. Zoology. NERVOUS SYSTEM OF VERTEBRATES. 373 Mid brain. Optic lobes, corpora blgemlna or quadrigemlna (meseD- ceplialon). Crura cerebri. Optic ventricle or Iter a tertio ad quartum ventrlculum. Hind brain. Cerebellum (with its ventricle and the pons varolii, form- ing the metencephalon). Medulla oblongata and fourth ventricle. The accompanying sketches represent the typical nervous system of an amphibian, which also resembles that of many fishes, and even the lower Reptilia. The spinal cord (Pig. 368) usually extends through the whole length of the spina Stock Photo

RMRE09KJ–. Zoology for high schools and colleges. Zoology. NERVOUS SYSTEM OF VERTEBRATES. 373 Mid brain. Optic lobes, corpora blgemlna or quadrigemlna (meseD- ceplialon). Crura cerebri. Optic ventricle or Iter a tertio ad quartum ventrlculum. Hind brain. Cerebellum (with its ventricle and the pons varolii, form- ing the metencephalon). Medulla oblongata and fourth ventricle. The accompanying sketches represent the typical nervous system of an amphibian, which also resembles that of many fishes, and even the lower Reptilia. The spinal cord (Pig. 368) usually extends through the whole length of the spina

RFACWAHP–The brain

. Comparative anatomy. Anatomy, Comparative. 5o8 COMPARATIVE ANATOMY form a pathway for fibers to and from the cerebral cortex. From the posterior walls of the infundibulum are differentiated a tuber cinereum, and also paired mammillary bodies, which have fiber connexion with the olfactory organ. Fibers are also received from the cerebral cortex and sent to the thalami. (Fig. 420). OLFACTORY LOBE U=-J TELENCEPHALON DIENCEPHALON MESENCEPHALON METENCEPHALON MYELENCEPHALDN Fig. 425.—A diagram of the brain of a four-months fetus as seen in median longi- tudinal section. The figure shows the locati Stock Photo

RMREERBH–. Comparative anatomy. Anatomy, Comparative. 5o8 COMPARATIVE ANATOMY form a pathway for fibers to and from the cerebral cortex. From the posterior walls of the infundibulum are differentiated a tuber cinereum, and also paired mammillary bodies, which have fiber connexion with the olfactory organ. Fibers are also received from the cerebral cortex and sent to the thalami. (Fig. 420). OLFACTORY LOBE U=-J TELENCEPHALON DIENCEPHALON MESENCEPHALON METENCEPHALON MYELENCEPHALDN Fig. 425.—A diagram of the brain of a four-months fetus as seen in median longi- tudinal section. The figure shows the locati

RFACWF4Y–The brain

. Anatomy in a nutshell : a treatise on human anatomy in its relation to osteopathy. Human anatomy; Osteopathic medicine; Osteopathic Medicine; Anatomy. PLATECCXWIII. CEREBRAL CORTEV. PROSENCEPHALON (ERERKUM) MESENCEPHALON i METENCEPHALON PONTIS / /PQNS*CEKEBELLUM| myelencephalon (medulla oblongata) NUCLEUS FASCICULUS CUNEA"r|£ - - NUCLEUS FASCICULUS C-RACILLIS SPINAL COHD Showing Both Sknsoiiy and Motor Pathways. Modified from Eckley-Jackson.) 436. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a Stock Photo

RMRN781N–. Anatomy in a nutshell : a treatise on human anatomy in its relation to osteopathy. Human anatomy; Osteopathic medicine; Osteopathic Medicine; Anatomy. PLATECCXWIII. CEREBRAL CORTEV. PROSENCEPHALON (ERERKUM) MESENCEPHALON i METENCEPHALON PONTIS / /PQNS*CEKEBELLUM| myelencephalon (medulla oblongata) NUCLEUS FASCICULUS CUNEA"r|£ - - NUCLEUS FASCICULUS C-RACILLIS SPINAL COHD Showing Both Sknsoiiy and Motor Pathways. Modified from Eckley-Jackson.) 436. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a

RFACWD2T–The brainstem

. A laboratory manual and text-book of embryology. Embryology. THE BRAIN 329 the anlage of the cerebellum. Its thickened ventral wall becomes the pons (Varolii). Its cavity constitutes the cranial portion of the fourth ventricle. The caudal border of the pons is taken as the ventral boundary line between the metencephalon and myelencephoton. The myelencephalon forms the medulla oblongata. Its dorsal wall is a thin non-nervous ependymal layer, which later becomes the posterior medullary velum. From its thickened ventro-lateral mh is Kb IVv. -ab -nk. Please note that these images are extracted f Stock Photo

RMRE05C6–. A laboratory manual and text-book of embryology. Embryology. THE BRAIN 329 the anlage of the cerebellum. Its thickened ventral wall becomes the pons (Varolii). Its cavity constitutes the cranial portion of the fourth ventricle. The caudal border of the pons is taken as the ventral boundary line between the metencephalon and myelencephoton. The myelencephalon forms the medulla oblongata. Its dorsal wall is a thin non-nervous ependymal layer, which later becomes the posterior medullary velum. From its thickened ventro-lateral mh is Kb IVv. -ab -nk. Please note that these images are extracted f

RFACTKGG–The brainstem

. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 409 The mesencephalon similarly shows on its floor and sides a sub- division into two regions which I shall call Alesomeres 1 and 2 (ü^^, M2). The rhombencephalon is marked at this stage by 6 neuromeres which I shall call Rhombomeres 1—6 (-Ri (;). The auditory in- vagination takes place opposite the two last (E5, Eg), and immediately behind these the rest of the hind brain, which in its complete condition for the sake of uniformity I venture to propose should be named the metencephalon, is indistinguishable from the spinal co Stock Photo

RMRN871F–. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 409 The mesencephalon similarly shows on its floor and sides a sub- division into two regions which I shall call Alesomeres 1 and 2 (ü^^, M2). The rhombencephalon is marked at this stage by 6 neuromeres which I shall call Rhombomeres 1—6 (-Ri (;). The auditory in- vagination takes place opposite the two last (E5, Eg), and immediately behind these the rest of the hind brain, which in its complete condition for the sake of uniformity I venture to propose should be named the metencephalon, is indistinguishable from the spinal co

RFACWEKM–The brainstem

RMRD9JD5–. Zoology : for students and general readers . Zoology. Mid brain. NEBVOUa SYSTEM OF VERTEBRATES. 393 {Optic lobes, corpora bigemlna or qaadrigemina (tnesen- cepbalon). Crura cerebri. Optic ventricle or Iter a tertio ad quartum ventriculum. Hind brain. Cerebellum (with its ventricle and the pons varolii, form- ing the metencephalon). Medulla oblongata and fourth ventricle. The accompanying sketches represent the typical nervous system of an amphibian, -which also resembles that of many fishes, and even the lower Reptilia. The spinal cord (Fig. 374) usually extends through the whole length of t

RFACW85T–The brain

. The chordates. Chordata. 164 Basic Structure of Vertebrates IV. Trochlear, mainly somatic motor, its fibers coming from a motor center located ventrally in the region of junction of the mesen- cephalon and the metencephalon, and supplying the dorsal oblique muscle. It may include some proprioceptive fibers. The trochlear nerves are the only nerves which emerge from the dorsal surface of the brain (Figs. 136, 138A). At the region of emergence, between the optic lobes and the cerebellum, the right and left nerves cross, forming a trochlear chiasma. V. Trigeminal, so called because in all verte Stock Photo

RMRJ5KK7–. The chordates. Chordata. 164 Basic Structure of Vertebrates IV. Trochlear, mainly somatic motor, its fibers coming from a motor center located ventrally in the region of junction of the mesen- cephalon and the metencephalon, and supplying the dorsal oblique muscle. It may include some proprioceptive fibers. The trochlear nerves are the only nerves which emerge from the dorsal surface of the brain (Figs. 136, 138A). At the region of emergence, between the optic lobes and the cerebellum, the right and left nerves cross, forming a trochlear chiasma. V. Trigeminal, so called because in all verte

RFACW7WT–The brainstem

. Chordate morphology. Morphology (Animals); Chordata. giving rise to nerve fibers. Also located in the floor of the mesencephalon is the functionally important red nucleus. Here the brain stem also contains fiber tracts connecting liigher and lower parts of the brain. These tracts are de- scribed as the peduncles. The metencephalon has a dorsal cerebellum and a ven- tral pons as well as the usual ascending and descending fiber tracts of the brain stem. The myelencephalon has a membranous roof, a chorioid ple.xus, and a thick basal por- tion consisting of bilateral reticular bodies, olivary nu Stock Photo

RMRJ6TC0–. Chordate morphology. Morphology (Animals); Chordata. giving rise to nerve fibers. Also located in the floor of the mesencephalon is the functionally important red nucleus. Here the brain stem also contains fiber tracts connecting liigher and lower parts of the brain. These tracts are de- scribed as the peduncles. The metencephalon has a dorsal cerebellum and a ven- tral pons as well as the usual ascending and descending fiber tracts of the brain stem. The myelencephalon has a membranous roof, a chorioid ple.xus, and a thick basal por- tion consisting of bilateral reticular bodies, olivary nu

RFACTGFM–The brainstem

RMRN782H–. Anatomy in a nutshell : a treatise on human anatomy in its relation to osteopathy. Human anatomy; Osteopathic medicine; Osteopathic Medicine; Anatomy. PLATE CCXXX. CEREBRAL CORTEX OPTIC THALAMUS CORPORA QUADRIOEWINA CEREBELLAR CORTEX NUCLEUS DENTATUS. prosencephalon ( [cerebrum) mesencephalon (mid brain) NUCLEUS FASCICULUS CUNEATUS NUCLEUS FASCICULUS GRACILLIS NUCLEI I METENCEPHALON PONTIS /pONSiCEREBELLUM ULBAR V. MYELENCEPHALON NUCLEI ( MEQULLA OBLONGATA SPINAL CORD Showing the Sensory Pathways to the Brain. 330 (Modified from Eckley's Jackson.). Please note that these images are extract

RFACWG0X–The brainstem

. Comparative anatomy. Anatomy, Comparative. = -" . 1a"l>r pl>te ibasal plate ifloor plate - ' MESEINCEPHALON EPIPHYSIS TELENCEPHALON METENCEPHALON MYELENCEPHALON TERMINALIS.. PREOPTIC RECESS Fig. 447.—Diagrams of the development of the brain. A, Early neural plate before closure, with zones marked; B, Longitudinal section of early brain tube; C, Later stage with parts diiTerentiated. The dorsal zone (alar plate) is finely stippled; the ventral zone (basal plate) is coarsely stippled; the floor plate is cross-hatched. Cer., cere- bellum; c.str., corpus striatum; inf., infundibu Stock Photo

RMREF7EK–. Comparative anatomy. Anatomy, Comparative. = -" . 1a"l>r pl>te ibasal plate ifloor plate - ' MESEINCEPHALON EPIPHYSIS TELENCEPHALON METENCEPHALON MYELENCEPHALON TERMINALIS.. PREOPTIC RECESS Fig. 447.—Diagrams of the development of the brain. A, Early neural plate before closure, with zones marked; B, Longitudinal section of early brain tube; C, Later stage with parts diiTerentiated. The dorsal zone (alar plate) is finely stippled; the ventral zone (basal plate) is coarsely stippled; the floor plate is cross-hatched. Cer., cere- bellum; c.str., corpus striatum; inf., infundibu

RFACWDHN–The brainstem

. The chordates. Chordata. MESENCEPHALON EPIPHYSIS DIENCEPHALON- TELENCEPHALON METENCEPHALON « TELENCEPHALON. OLFACTORY I PONTINE FLEXURE CERVICAL FLEXURE SPINAL CORD Fig. 135. Three stages in the development of the human brain, showing the brain-vesicles and flexures. (A) Early stage, dorsal aspect. (B) Brain of a three- week embryo in lateral aspect. (C) Brain of an eight-week embryo in lateral aspect. (After His and Hardesty. Courtesy, Neal and Band: "Chordate Anatomy," Philadelphia, The Blakiston Company.). Please note that these images are extracted from scanned page images that Stock Photo

RMRJ5M03–. The chordates. Chordata. MESENCEPHALON EPIPHYSIS DIENCEPHALON- TELENCEPHALON METENCEPHALON « TELENCEPHALON. OLFACTORY I PONTINE FLEXURE CERVICAL FLEXURE SPINAL CORD Fig. 135. Three stages in the development of the human brain, showing the brain-vesicles and flexures. (A) Early stage, dorsal aspect. (B) Brain of a three- week embryo in lateral aspect. (C) Brain of an eight-week embryo in lateral aspect. (After His and Hardesty. Courtesy, Neal and Band: "Chordate Anatomy," Philadelphia, The Blakiston Company.). Please note that these images are extracted from scanned page images that

RFACWG4X–The brainstem

. The elasmobranch fishes. Chondrichthyes. 222 THE ELASMOBRAXCH FISHES. Fig. 201. Cross-section of cord, Hep- tanchus cinereus. (From Sterzi.) (Grey matter stippled.) d.h., dorsal horn; v.h., ventral horn. the mesencephalon and near the cerebellnm the fourth cranial or trochlear nerve arises {IV). Ventrally the mesensephalon is composed of large fiber tracts through which the third cranial or oculomotor nerve (7/7) emerges and passes forward to muscles of the eye. The metencephalon consists, in large part, of the cerebellum (c6.), a large shield-shaped mass, separated dorsally into right and l Stock Photo

RMRD7GXW–. The elasmobranch fishes. Chondrichthyes. 222 THE ELASMOBRAXCH FISHES. Fig. 201. Cross-section of cord, Hep- tanchus cinereus. (From Sterzi.) (Grey matter stippled.) d.h., dorsal horn; v.h., ventral horn. the mesencephalon and near the cerebellnm the fourth cranial or trochlear nerve arises {IV). Ventrally the mesensephalon is composed of large fiber tracts through which the third cranial or oculomotor nerve (7/7) emerges and passes forward to muscles of the eye. The metencephalon consists, in large part, of the cerebellum (c6.), a large shield-shaped mass, separated dorsally into right and l

RFACTHYW–The brainstem

. A laboratory manual and text-book of embryology. Embryology. 326 THE MORPHOGENESIS OF THE CENTRAL NERVOUS SYSTEM alic flexure, now more marked, forms an acute angle and the pontine flexure, just indicated in the previous stage, is now a prominent ventral bend in the ventro-lateral walls of the hind-brain (Fig. 313 A, B). This flexure forms the boundary line which subdivides the rhombencephalon into a cranial portion, the metencephalon, and into a caudal portion, the myelencephalon. At a third bend the whole brain is flexed ventrally at an angle with the axis of the spinal cord. This bend is Stock Photo

RMRE05CP–. A laboratory manual and text-book of embryology. Embryology. 326 THE MORPHOGENESIS OF THE CENTRAL NERVOUS SYSTEM alic flexure, now more marked, forms an acute angle and the pontine flexure, just indicated in the previous stage, is now a prominent ventral bend in the ventro-lateral walls of the hind-brain (Fig. 313 A, B). This flexure forms the boundary line which subdivides the rhombencephalon into a cranial portion, the metencephalon, and into a caudal portion, the myelencephalon. At a third bend the whole brain is flexed ventrally at an angle with the axis of the spinal cord. This bend is

RFACW7PG–The brainstem

. Anatomy, descriptive and applied. Anatomy. THE BRAIN OR ENCEPHALON 851 The simple brain tube expands very early in intrauterine life in a sac-like manner, with the formation of three dilatations or pouches—the primary brain vesicles—demarcated by two constrictions.' The vesicles are designated respec- tively the Fore-brain (Prosencephalon). Mid-brain (Mesencephalon). Hind-brain (Rhombencephalon or Metencephalon). NEUROPORE -. l 2 IFORE.-BRAJN Fio. 620.—Brain tube of embryo salamander, sagittal section, showing neural segmentation (neuromeres): F.l.lll. Fore-brain neuronieres. M. l.-II. Mid Stock Photo

RMRN5WEN–. Anatomy, descriptive and applied. Anatomy. THE BRAIN OR ENCEPHALON 851 The simple brain tube expands very early in intrauterine life in a sac-like manner, with the formation of three dilatations or pouches—the primary brain vesicles—demarcated by two constrictions.' The vesicles are designated respec- tively the Fore-brain (Prosencephalon). Mid-brain (Mesencephalon). Hind-brain (Rhombencephalon or Metencephalon). NEUROPORE -. l 2 IFORE.-BRAJN Fio. 620.—Brain tube of embryo salamander, sagittal section, showing neural segmentation (neuromeres): F.l.lll. Fore-brain neuronieres. M. l.-II. Mid

RFACW92K–The brainstem

$. The chordates. Chordata. â^ tourth ventrich lv {Metencephalon (Fourth ventricle Myelencephalon Fig. 136. (Left) The brain of the dogfish, Squalus acanthias, dorsal view. (Right) The brain of the dogfish, Squalus acanthias, with the ventricles opened, dorsal view. (Courtesy, Ranson: "The Anatomy of the Nervous System," Phila- delphia, W. B. Saunders Co.) Cerebral hemisphere Optic lobe Paraphysis I i . â . Metacazlt Olfactory tract Olfactory bulb Tuberculum acusticum Tela chorioidea I Fourth ventricle Visceral lobe. -Y i 5 ""T"' Telencephalon I i I ] j Metencephal Stock Photo$

RMRJ5KWP–. The chordates. Chordata. â^ tourth ventrich lv {Metencephalon (Fourth ventricle Myelencephalon Fig. 136. (Left) The brain of the dogfish, Squalus acanthias, dorsal view. (Right) The brain of the dogfish, Squalus acanthias, with the ventricles opened, dorsal view. (Courtesy, Ranson: "The Anatomy of the Nervous System," Phila- delphia, W. B. Saunders Co.) Cerebral hemisphere Optic lobe Paraphysis I i . â . Metacazlt Olfactory tract Olfactory bulb Tuberculum acusticum Tela chorioidea I Fourth ventricle Visceral lobe. -Y i 5 ""T"' Telencephalon I i I ] j Metencephal

RFACTH1Y–The brainstem

$. The chordates. Chordata. Cerebellum Lobus lineae lateralii ----Facial nerve N. VII Medulla oblongata --- Glossopharyngeal nerve N. IX Medial longitudinal fasc. Visceral lob Vagus nerve N. X Spinal cord. â^ tourth ventrich lv {Metencephalon (Fourth ventricle Myelencephalon Fig. 136. (Left) The brain of the dogfish, Squalus acanthias, dorsal view. (Right) The brain of the dogfish, Squalus acanthias, with the ventricles opened, dorsal view. (Courtesy, Ranson: "The Anatomy of the Nervous System," Phila- delphia, W. B. Saunders Co.) Cerebral hemisphere Optic lobe Paraphysis I i . â . M Stock Photo$

RMRJ5KXF–. The chordates. Chordata. Cerebellum Lobus lineae lateralii ----Facial nerve N. VII Medulla oblongata --- Glossopharyngeal nerve N. IX Medial longitudinal fasc. Visceral lob Vagus nerve N. X Spinal cord. â^ tourth ventrich lv {Metencephalon (Fourth ventricle Myelencephalon Fig. 136. (Left) The brain of the dogfish, Squalus acanthias, dorsal view. (Right) The brain of the dogfish, Squalus acanthias, with the ventricles opened, dorsal view. (Courtesy, Ranson: "The Anatomy of the Nervous System," Phila- delphia, W. B. Saunders Co.) Cerebral hemisphere Optic lobe Paraphysis I i . â . M

RFACTMBJ–The brainstem

. Comparative anatomy. Anatomy, Comparative. 488 COMPARATIVE ANATOMY. Fig. 404.—Brain and cranial nerves of Carcharias littoralis (Princeton 310), natural size, bo, olfactory bulb; br^*, branchial nerves; cr, auricle of medulla; d, diencephalon; e, epiphysial staUc, the pineal organ lacking; ec, external canal of ear; er, external rectus; eo, external oblique; hm, hyomandibular nerve; io, inferior oblique; I, lateralis nerve; tnd, mandibularis nerve; ml, myelencephalon; ms, mesencephalon, also, maxillaris superior; ml, metencephalon; 00, olfactory organ; os, ophthalmicus superficialis nerve; Stock Photo

RMREF7W3–. Comparative anatomy. Anatomy, Comparative. 488 COMPARATIVE ANATOMY. Fig. 404.—Brain and cranial nerves of Carcharias littoralis (Princeton 310), natural size, bo, olfactory bulb; br^*, branchial nerves; cr, auricle of medulla; d, diencephalon; e, epiphysial staUc, the pineal organ lacking; ec, external canal of ear; er, external rectus; eo, external oblique; hm, hyomandibular nerve; io, inferior oblique; I, lateralis nerve; tnd, mandibularis nerve; ml, myelencephalon; ms, mesencephalon, also, maxillaris superior; ml, metencephalon; 00, olfactory organ; os, ophthalmicus superficialis nerve;

RFACTPTP–The brainstem

. A laboratory manual and text-book of embryology. Embryology. 122 THE STUDY OF SIX AND TEN MILLIMETER PIG EMBRYOS the head, the shorter tail, the much smaller mesonephric region, the longer umbilical cord and the less prominent segments. The yolk-sac is pear-shaped with long slender yolk-stalk. Central Nervous System and Viscera.—Dissections show well the form and relations of the organs (Figs. 115, 116 and 117). Directions for preparing dis- sections are given in Chapter VI. Metencephalon N. trochlearis Gang. n. 5 I Mesencephalon Gang. Gang, jugula Gang, petrosa Gang. Fror Gang, nodos. n. Stock Photo

RMRE0745–. A laboratory manual and text-book of embryology. Embryology. 122 THE STUDY OF SIX AND TEN MILLIMETER PIG EMBRYOS the head, the shorter tail, the much smaller mesonephric region, the longer umbilical cord and the less prominent segments. The yolk-sac is pear-shaped with long slender yolk-stalk. Central Nervous System and Viscera.—Dissections show well the form and relations of the organs (Figs. 115, 116 and 117). Directions for preparing dis- sections are given in Chapter VI. Metencephalon N. trochlearis Gang. n. 5 I Mesencephalon Gang. Gang, jugula Gang, petrosa Gang. Fror Gang, nodos. n.

RFACTNGT–The brainstem

. Chordate anatomy. Chordata; Anatomy, Comparative. IKIFUNOIBULUM MAMMILLARY BODY OTIC CAPSULE MESENCEPHALON EPIPHYSIS DIENCEPHALON TELENCEPHALON METENCEPHALON YELENCEPHALON. OLFACTORY LOBE PONTINE FLEXURE CERVICAL FLEXURE SPINAL CORD A. B. C. Fig. 340.—Three stages—A, B, and C—in the development of the human brain, showing the brain vesicles and flexures. A is an early stage, dorsal aspect, B the brain of a three-weeks embryo in lateral aspect. C that of an eight-weeks embryo in lateral aspect. (Redrawn after His and Hardesty.) As the neural folds rise, they bend towards the median plane and Stock Photo

RMRJ4YWX–. Chordate anatomy. Chordata; Anatomy, Comparative. IKIFUNOIBULUM MAMMILLARY BODY OTIC CAPSULE MESENCEPHALON EPIPHYSIS DIENCEPHALON TELENCEPHALON METENCEPHALON YELENCEPHALON. OLFACTORY LOBE PONTINE FLEXURE CERVICAL FLEXURE SPINAL CORD A. B. C. Fig. 340.—Three stages—A, B, and C—in the development of the human brain, showing the brain vesicles and flexures. A is an early stage, dorsal aspect, B the brain of a three-weeks embryo in lateral aspect. C that of an eight-weeks embryo in lateral aspect. (Redrawn after His and Hardesty.) As the neural folds rise, they bend towards the median plane and

RFACTJ6M–Cerebral arteries

. Comparative anatomy. Anatomy, Comparative. -Optic lobes *^ Trochlear nerve N. I' -Cerebellum â Lcbus linecB lateralis. Facial nerve N. VII Acoustic nerve N. VIIT.., Tuberculum acusticum Medulla oblongata Glossopharyngeal nerve N. IX â âMedial longitudinal fasc.... -Visceral lobe Vagus nerve N. X Spinal cord. Telencephalon Third ventricle > Diencephalon '-Mesoccde ^Mesencephalon y ^Fourth ventricle Metencephalon '.^â Cerebellum (caudal part) 4 Fourth ventricle Myelencephalon > Fig. 402.âThe brain of the dogfish, Squalus acanthias, dorsal view. (From Ranson's "The Anatomy of th Stock Photo

RMREF7WB–. Comparative anatomy. Anatomy, Comparative. -Optic lobes *^ Trochlear nerve N. I' -Cerebellum â Lcbus linecB lateralis. Facial nerve N. VII Acoustic nerve N. VIIT.., Tuberculum acusticum Medulla oblongata Glossopharyngeal nerve N. IX â âMedial longitudinal fasc.... -Visceral lobe Vagus nerve N. X Spinal cord. Telencephalon Third ventricle > Diencephalon '-Mesoccde ^Mesencephalon y ^Fourth ventricle Metencephalon '.^â Cerebellum (caudal part) 4 Fourth ventricle Myelencephalon > Fig. 402.âThe brain of the dogfish, Squalus acanthias, dorsal view. (From Ranson's "The Anatomy of th

RFACTMAX–Arteries of the brain

. A laboratory manual and text-book of embryology. Embryology. * Metencephalon 'Hind-brain) Rhomboid fossa /Lamina Corp Rhinencephalon / lerniinalis striatu {Olfactory-brain) rass. Fig. 314.—Brain of a 13.6 mm. human embryo in median sagittal section (after His from Sobotta's Atlas of Anatomy), i, optic recess; 2, ridge formed by optic chiasma, 3; 4, infundibular recess. the tela chorioidea. The ventrolateral walls of this same region on the other hand are very thick. A median sagittal section of a brain at a somewhat later stage shows the cervical, pontine and cephalic flexures well marked (F Stock Photo

RMRE05CC–. A laboratory manual and text-book of embryology. Embryology. * Metencephalon 'Hind-brain) Rhomboid fossa /Lamina Corp Rhinencephalon / lerniinalis striatu {Olfactory-brain) rass. Fig. 314.—Brain of a 13.6 mm. human embryo in median sagittal section (after His from Sobotta's Atlas of Anatomy), i, optic recess; 2, ridge formed by optic chiasma, 3; 4, infundibular recess. the tela chorioidea. The ventrolateral walls of this same region on the other hand are very thick. A median sagittal section of a brain at a somewhat later stage shows the cervical, pontine and cephalic flexures well marked (F

RFACWG6Y–Cerebral arteries

. The anatomical record. Anatomy; Anatomy. p-. XI XII X IX VIII VII (L $ }?Uc^<Urv Fig. 1 Dorsal view of cord and metencephalon of the tortoise, Clemmys marmorata, with the dura and arachnoid removed, showing capillaries, c; dorsal fissure, /; metapore, p, after removal of the brain-bladder; the line along which the metatelus tears in removing the metaplexus, m; the sulci and ridges in the floor of the fourth ventricle, k; the cerebellum I. Fig. 2 Dorsal view of metencephalon after removal of the two outer mem- branes, showing roof of fourth ventricle with the brain-bladder, b. Fig. 3 Vent Stock Photo

RMRN9DE4–. The anatomical record. Anatomy; Anatomy. p-. XI XII X IX VIII VII (L $ }?Uc^<Urv Fig. 1 Dorsal view of cord and metencephalon of the tortoise, Clemmys marmorata, with the dura and arachnoid removed, showing capillaries, c; dorsal fissure, /; metapore, p, after removal of the brain-bladder; the line along which the metatelus tears in removing the metaplexus, m; the sulci and ridges in the floor of the fourth ventricle, k; the cerebellum I. Fig. 2 Dorsal view of metencephalon after removal of the two outer mem- branes, showing roof of fourth ventricle with the brain-bladder, b. Fig. 3 Vent

RFACTJKP–Cerebral arteries

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