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Sea urchin nervous system Stock Photos and Images
Echinus acutus, a species of sea urchins. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-echinus-acutus-a-species-of-sea-urchins-28744783.htmlRMBJNC7B–Echinus acutus, a species of sea urchins.
. Animal biology. Biology; Zoology; Physiology. SURVEY OF INVERTEBRATES 85 The nervous system is essentially a nerve ring encircling the mouth, with a branch extending into each arm, but there is no central, dominating nerve mass that is comparable to a brain, and only. Fig. 47.— A, Sea Urchin, Asthenosoma, oral view; B, Sea Cucumber, Cucu- maria; C, Sea Lily, Metacrinus. (From Thomson, Ludvig, and Carpenter.) the simplest sense organs, the tube feet acting largely in the latter capacity. The functions of a circulatory and respiratory system are carried on by the coelomic fluid — mostly sea-wa Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/animal-biology-biology-zoology-physiology-survey-of-invertebrates-85-the-nervous-system-is-essentially-a-nerve-ring-encircling-the-mouth-with-a-branch-extending-into-each-arm-but-there-is-no-central-dominating-nerve-mass-that-is-comparable-to-a-brain-and-only-fig-47-a-sea-urchin-asthenosoma-oral-view-b-sea-cucumber-cucu-maria-c-sea-lily-metacrinus-from-thomson-ludvig-and-carpenter-the-simplest-sense-organs-the-tube-feet-acting-largely-in-the-latter-capacity-the-functions-of-a-circulatory-and-respiratory-system-are-carried-on-by-the-coelomic-fluid-mostly-sea-wa-image236768572.htmlRMRN5MMC–. Animal biology. Biology; Zoology; Physiology. SURVEY OF INVERTEBRATES 85 The nervous system is essentially a nerve ring encircling the mouth, with a branch extending into each arm, but there is no central, dominating nerve mass that is comparable to a brain, and only. Fig. 47.— A, Sea Urchin, Asthenosoma, oral view; B, Sea Cucumber, Cucu- maria; C, Sea Lily, Metacrinus. (From Thomson, Ludvig, and Carpenter.) the simplest sense organs, the tube feet acting largely in the latter capacity. The functions of a circulatory and respiratory system are carried on by the coelomic fluid — mostly sea-wa
. Animal biology. Zoology; Biology. 210 METAZOAN PHYLA different classes resemble each other in a general way, but each is quite distinct. That of a starfish is known as a bipinnaria or brachiolaria, that of a brittle star as an ophiopluteus, that of a sea urchin as an echino- pluteus, and that of a sea cucumber as an auricularia. 242. Behavior.—In the echinoderms the nervous system does not seem to control the muscles as does a centralized system in other animals but simply maintains a certain tonus, a condition accompanied by readi- ness to respond to stimuli. The response itself is, general Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/animal-biology-zoology-biology-210-metazoan-phyla-different-classes-resemble-each-other-in-a-general-way-but-each-is-quite-distinct-that-of-a-starfish-is-known-as-a-bipinnaria-or-brachiolaria-that-of-a-brittle-star-as-an-ophiopluteus-that-of-a-sea-urchin-as-an-echino-pluteus-and-that-of-a-sea-cucumber-as-an-auricularia-242-behaviorin-the-echinoderms-the-nervous-system-does-not-seem-to-control-the-muscles-as-does-a-centralized-system-in-other-animals-but-simply-maintains-a-certain-tonus-a-condition-accompanied-by-readi-ness-to-respond-to-stimuli-the-response-itself-is-general-image236766974.htmlRMRN5JKA–. Animal biology. Zoology; Biology. 210 METAZOAN PHYLA different classes resemble each other in a general way, but each is quite distinct. That of a starfish is known as a bipinnaria or brachiolaria, that of a brittle star as an ophiopluteus, that of a sea urchin as an echino- pluteus, and that of a sea cucumber as an auricularia. 242. Behavior.—In the echinoderms the nervous system does not seem to control the muscles as does a centralized system in other animals but simply maintains a certain tonus, a condition accompanied by readi- ness to respond to stimuli. The response itself is, general
![. Jelly-fish, star-fish and sea-urchins [microform] : being a research on primitive nervous systems. Nervous system; Jellyfishes; Starfishes; Sea urchins; Nerveux, Système; Méduses; Astérides; Echinides. STAR-FISH AND SEA-URCHINS. 263 sea-cucumbers and lily-stars (Fig. 38). Without, however, waiting to consider these, I shall go a little more particularly into the modification of Star-fish structure which is presented by the sea-urchin, or Echinus (Fig. 39).. Fig. 37.—A Brittle-star. (I'rom CasscU's " Nat. Hist.") Externally, the animal presents the form of an orange, and is complete Stock Photo](https://c8.alamy.com/comp/RJ1FG6/jelly-fish-star-fish-and-sea-urchins-microform-being-a-research-on-primitive-nervous-systems-nervous-system-jellyfishes-starfishes-sea-urchins-nerveux-systme-mduses-astrides-echinides-star-fish-and-sea-urchins-263-sea-cucumbers-and-lily-stars-fig-38-without-however-waiting-to-consider-these-i-shall-go-a-little-more-particularly-into-the-modification-of-star-fish-structure-which-is-presented-by-the-sea-urchin-or-echinus-fig-39-fig-37a-brittle-star-irom-casscus-quot-nat-histquot-externally-the-animal-presents-the-form-of-an-orange-and-is-complete-RJ1FG6.jpg ". Jelly-fish, star-fish and sea-urchins [microform] : being a research on primitive nervous systems. Nervous system; Jellyfishes; Starfishes; Sea urchins; Nerveux, Système; Méduses; Astérides; Echinides. STAR-FISH AND SEA-URCHINS. 263 sea-cucumbers and lily-stars (Fig. 38). Without, however, waiting to consider these, I shall go a little more particularly into the modification of Star-fish structure which is presented by the sea-urchin, or Echinus (Fig. 39).. Fig. 37.—A Brittle-star. (I'rom CasscU's " Nat. Hist.") Externally, the animal presents the form of an orange, and is complete Stock Photo")
. Jelly-fish, star-fish and sea-urchins [microform] : being a research on primitive nervous systems. Nervous system; Jellyfishes; Starfishes; Sea urchins; Nerveux, Système; Méduses; Astérides; Echinides. STAR-FISH AND SEA-URCHINS. 263 sea-cucumbers and lily-stars (Fig. 38). Without, however, waiting to consider these, I shall go a little more particularly into the modification of Star-fish structure which is presented by the sea-urchin, or Echinus (Fig. 39).. Fig. 37.—A Brittle-star. (I'rom CasscU's " Nat. Hist.") Externally, the animal presents the form of an orange, and is complete Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/jelly-fish-star-fish-and-sea-urchins-microform-being-a-research-on-primitive-nervous-systems-nervous-system-jellyfishes-starfishes-sea-urchins-nerveux-systme-mduses-astrides-echinides-star-fish-and-sea-urchins-263-sea-cucumbers-and-lily-stars-fig-38-without-however-waiting-to-consider-these-i-shall-go-a-little-more-particularly-into-the-modification-of-star-fish-structure-which-is-presented-by-the-sea-urchin-or-echinus-fig-39-fig-37a-brittle-star-irom-casscus-quot-nat-histquot-externally-the-animal-presents-the-form-of-an-orange-and-is-complete-image234832758.htmlRMRJ1FG6–. Jelly-fish, star-fish and sea-urchins [microform] : being a research on primitive nervous systems. Nervous system; Jellyfishes; Starfishes; Sea urchins; Nerveux, Système; Méduses; Astérides; Echinides. STAR-FISH AND SEA-URCHINS. 263 sea-cucumbers and lily-stars (Fig. 38). Without, however, waiting to consider these, I shall go a little more particularly into the modification of Star-fish structure which is presented by the sea-urchin, or Echinus (Fig. 39).. Fig. 37.—A Brittle-star. (I'rom CasscU's " Nat. Hist.") Externally, the animal presents the form of an orange, and is complete
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEURAL DEVELOPMENT IN ECHINOIDS 271. Figure 1. Diagrams of pluteus larvae. (A) Previously demonstrated sites of innervation (solid fill) in a sea urchin larva (Nakajima. 1986; Bisgrove and Burke, 1987; Thorndyke et ai. 1992). (B) The extent of the nervous system, as revealed in this study. (C) The main areas of S 1-Li IR (gray) in the early 4-armed. early 6-armed. and 8-armed pluteus. (D) The mam areas of S2-Li IR (gray) in the 6-armed pluteus. (E) The main areas of 5HT-L1 IR (gray) in the early 4-armed. early 6-armed. and 8 Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-neural-development-in-echinoids-271-figure-1-diagrams-of-pluteus-larvae-a-previously-demonstrated-sites-of-innervation-solid-fill-in-a-sea-urchin-larva-nakajima-1986-bisgrove-and-burke-1987-thorndyke-et-ai-1992-b-the-extent-of-the-nervous-system-as-revealed-in-this-study-c-the-main-areas-of-s-1-li-ir-gray-in-the-early-4-armed-early-6-armed-and-8-armed-pluteus-d-the-mam-areas-of-s2-li-ir-gray-in-the-6-armed-pluteus-e-the-main-areas-of-5ht-l1-ir-gray-in-the-early-4-armed-early-6-armed-and-8-image234616703.htmlRMRHKKYY–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEURAL DEVELOPMENT IN ECHINOIDS 271. Figure 1. Diagrams of pluteus larvae. (A) Previously demonstrated sites of innervation (solid fill) in a sea urchin larva (Nakajima. 1986; Bisgrove and Burke, 1987; Thorndyke et ai. 1992). (B) The extent of the nervous system, as revealed in this study. (C) The main areas of S 1-Li IR (gray) in the early 4-armed. early 6-armed. and 8-armed pluteus. (D) The mam areas of S2-Li IR (gray) in the 6-armed pluteus. (E) The main areas of 5HT-L1 IR (gray) in the early 4-armed. early 6-armed. and 8
. Text book of zoology. Zoology. Fig. 78 and 79. Diagram- matic longitudinal section of a Star-fisli and of a Sea- urchin, pass'ng through a radins on the right, an inter- radius on the left, a anus, i gut, fc body-wall, I cEecum of the gut, m mouth, ma madreporite, n radial nerve, o in Fig. 78 eye, in Fig. 79 sensory spot, p ampulla, r- radial canal, s stone canal, sk skeletal plate. The Polian vesicles, eio. are left out.— Orig. The nervous system in all Echinoderms consists of a nerve- ring round the mouth, from which nerve cords pass off to the radii. In Starfish and Crinoids both the ring Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/text-book-of-zoology-zoology-fig-78-and-79-diagram-matic-longitudinal-section-of-a-star-fisli-and-of-a-sea-urchin-passng-through-a-radins-on-the-right-an-inter-radius-on-the-left-a-anus-i-gut-fc-body-wall-i-ceecum-of-the-gut-m-mouth-ma-madreporite-n-radial-nerve-o-in-fig-78-eye-in-fig-79-sensory-spot-p-ampulla-r-radial-canal-s-stone-canal-sk-skeletal-plate-the-polian-vesicles-eio-are-left-out-orig-the-nervous-system-in-all-echinoderms-consists-of-a-nerve-ring-round-the-mouth-from-which-nerve-cords-pass-off-to-the-radii-in-starfish-and-crinoids-both-the-ring-image232422929.htmlRMRE3NPW–. Text book of zoology. Zoology. Fig. 78 and 79. Diagram- matic longitudinal section of a Star-fisli and of a Sea- urchin, pass'ng through a radins on the right, an inter- radius on the left, a anus, i gut, fc body-wall, I cEecum of the gut, m mouth, ma madreporite, n radial nerve, o in Fig. 78 eye, in Fig. 79 sensory spot, p ampulla, r- radial canal, s stone canal, sk skeletal plate. The Polian vesicles, eio. are left out.— Orig. The nervous system in all Echinoderms consists of a nerve- ring round the mouth, from which nerve cords pass off to the radii. In Starfish and Crinoids both the ring
![. Elementary zoology. Zoology. BRANCH ECHINODERMATA: STARFISHES, ETC. 115 tain small pigment-cells and communicate with the nervous system. From a general inspection of the sea-urchin's shell the Echinoderm characteristics, namely, radial symmetry and the presence of the water-vascular system, are readily seen. While at first glance there is apparent little similarity between the starfish and sea-urchin, neverthe- less careful examination shows that the two animals -are. Fig. 21.—"Test" of sea-urchin, Strongylocentrotus franciscanus, with spines removed. (From specimen.) alike in the Stock Photo](https://c8.alamy.com/comp/RCX2N4/elementary-zoology-zoology-branch-echinodermata-starfishes-etc-115-tain-small-pigment-cells-and-communicate-with-the-nervous-system-from-a-general-inspection-of-the-sea-urchins-shell-the-echinoderm-characteristics-namely-radial-symmetry-and-the-presence-of-the-water-vascular-system-are-readily-seen-while-at-first-glance-there-is-apparent-little-similarity-between-the-starfish-and-sea-urchin-neverthe-less-careful-examination-shows-that-the-two-animals-are-fig-21quottestquot-of-sea-urchin-strongylocentrotus-franciscanus-with-spines-removed-from-specimen-alike-in-the-RCX2N4.jpg ". Elementary zoology. Zoology. BRANCH ECHINODERMATA: STARFISHES, ETC. 115 tain small pigment-cells and communicate with the nervous system. From a general inspection of the sea-urchin's shell the Echinoderm characteristics, namely, radial symmetry and the presence of the water-vascular system, are readily seen. While at first glance there is apparent little similarity between the starfish and sea-urchin, neverthe- less careful examination shows that the two animals -are. Fig. 21.—"Test" of sea-urchin, Strongylocentrotus franciscanus, with spines removed. (From specimen.) alike in the Stock Photo")
. Elementary zoology. Zoology. BRANCH ECHINODERMATA: STARFISHES, ETC. 115 tain small pigment-cells and communicate with the nervous system. From a general inspection of the sea-urchin's shell the Echinoderm characteristics, namely, radial symmetry and the presence of the water-vascular system, are readily seen. While at first glance there is apparent little similarity between the starfish and sea-urchin, neverthe- less careful examination shows that the two animals -are. Fig. 21.—"Test" of sea-urchin, Strongylocentrotus franciscanus, with spines removed. (From specimen.) alike in the Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/elementary-zoology-zoology-branch-echinodermata-starfishes-etc-115-tain-small-pigment-cells-and-communicate-with-the-nervous-system-from-a-general-inspection-of-the-sea-urchins-shell-the-echinoderm-characteristics-namely-radial-symmetry-and-the-presence-of-the-water-vascular-system-are-readily-seen-while-at-first-glance-there-is-apparent-little-similarity-between-the-starfish-and-sea-urchin-neverthe-less-careful-examination-shows-that-the-two-animals-are-fig-21quottestquot-of-sea-urchin-strongylocentrotus-franciscanus-with-spines-removed-from-specimen-alike-in-the-image231683568.htmlRMRCX2N4–. Elementary zoology. Zoology. BRANCH ECHINODERMATA: STARFISHES, ETC. 115 tain small pigment-cells and communicate with the nervous system. From a general inspection of the sea-urchin's shell the Echinoderm characteristics, namely, radial symmetry and the presence of the water-vascular system, are readily seen. While at first glance there is apparent little similarity between the starfish and sea-urchin, neverthe- less careful examination shows that the two animals -are. Fig. 21.—"Test" of sea-urchin, Strongylocentrotus franciscanus, with spines removed. (From specimen.) alike in the
