The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 146 THE FOURTH DAY. Fig. 48. [chap.

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RMRWNET5–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 H

RMRWNEFW–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 II.] THE HEAD-FOLD. Fig. 8. 29 A --:pp C B

RMRWREFE–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 Two VIEWS OF THE HeAET OF A CHICK UPON THE FlFTH DaT OF INCUBATION, A from the ventral, B from the dorsal side. I. a. left auricular appendage, r. a. right auricular appendage, r. v. right ventricle, l.v. left ventricle, b. bulbus arteriosus.

RMRWPRTD–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 148 THE FOURTH DAT. [chap. siirface of the cloaca by a long hollow stalk, which places its cavity in commiinication with that of the alimentary canal. Both vesicle and stalk have an outer coat of mesoblast and an inner lining of what apparently is hypoblast. So much any observer may readily determine for himself; but of the earliest stages of the development of this organ different embryologists have given very different accounts. Von Baer believed that, soon after the cloaca was formed by the enl

RMRWRMNF–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 226 THE DEVELOPMENT OF THE SKULL. [CHAP. from its relations to the notochord, and as such we shall continue to speak of it. The second of the two divisions into which the parts of the skull fall, consists of a series of paired rods, whose proximal extremities are attached more or less closely to the investing mass. All of these (with the exception of the trabeculse) are developed along the axes of the visceral arches. EiG. 68. cvl View feom above oe the Investing Mass and op the Teabecul^ on TH

RMRWP62T–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 (0 THE SECOND DAY. [chap. situate in the envelopes of the nodal groups, as well as those lying on the exterior of the connecting processes, appropriate a quantity of the granular protoplasm surrounding each, and thus become converted into spindle-shaped cells. Each nodal group and each connecting process thus gets a distinct wall of nucleated cells. By the continued widening of the connecting processes and solution of their central portions, accompanied by a corresponding increase in the envelopin

RMRWPJH2–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 v.] THE TAIL-FOLD. 125 the whole archiblastic framework of the embryo became riddled by a network of parablast. From these parablastic elements he considered there arose not only the epitheKum (endothelium) of the blood-vessels and lymphatic spaces, but also all the connective-tissue elements of the body, the archiblast being represented in the vessels of the adult body by the muscular fibres alone. 17. As we stated above (p. 87), the folding in of the splanchnopleure to form the alimentary canal

RMRWPFKJ–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 110 THE THIRD DAY. [chap. epiblast furnishes the body of the cornea, the epiblast itself remaining as the anterior corneal epithelium. A portion of mesoblast, carried in from the front by the lens during its involution, gives rise to the capsule of the lens and suspensory ligament, while some mesoblast entering on the under side through the choroidal fissure becomes (in birds) tlie pecten, and probably also contributes to the vitreous humour. Of the walls of the optic cup, the thinner outer (poste

RMRWNET7–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 30 PRELIMINARY ACCOUNT. [chap. fore no lateral limits to the body of the embryo as distinguished from the blastcderni. Incidentally it shews the formation of the medullary groove by the rising up of the laminse dorsales. Beneath the section of the groove is seen the rudiment of the notochord. On either side a line indicates the cleavage of the mesoblast just commencing. This cleavage, it will be seen, does not exist in the more central parts of the embryo. In C, which represents a vertical longitu

RMRWPDB8–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 v.] THE CHOROIDAL FISSURE. 99 walls of the cnp taking place more rapidly than that of the lens, or in other words to the cavity of the cup dilating. But this growth or this dilatation does not take place equally in all parts of the cup. The walls of the cup rise up all round except that point of the circumference of the cup which is opposite the middle (from side to side) of the stalk. While elsewhere the walls increase rapidly in height, carrying so to speak the lens with them, at this spot, whic

RMRWRB8C–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 VI.] THE GERMINAL EPITHELIUjNI. 165 The median portion of the ridge is occupied by the projection of the Wolffian body, and here the epithelium rapidly becomes flattened. On the inside of the ridge, however, that is on the side looking towards the splanchnopleure, the epithelium not only retains its columnar character, but grows several cells deep (Fig. 51, a), while at the same time the mesoblast {E) under- lying it becomes thickened. In this way, owing partly to the increasing thickness of the e

RMRWT9HA–The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 IX.] THE ETHMO-PRESPHENOID PLATE. 231 posterior clinoid walls. But it is in front of the foremost of these that the most noticeable changes take place. From the mid-line of the coalesced trabeculse there rises up a high ridge, the ethmo-presphenoid plate. This plate is at first liighest behind. In front and below it sends out a process, the prenasal cartilage, which forms the cartilaginous basis on which the premaxillary region is moulded. 12. Development continues to be very rapid in these parts;

The elements of Embryology, (1874) The elements of Embryology, elementsofembryo74fost Year: 1874 146 THE FOURTH DAY. Fig. 48. [chap.

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