. Chordate anatomy. Chordata; Anatomy, Comparative. CORIUM ^EPIDERMIS PARIETAL NERVE PINEAL TRACT SUPERIOR HABENULAR' COMMISSURE â ^ MIDBRAIN iPOSTERIOR COMMISSURE. DORSAL SAC- SUPERIOR HABENULAR/ COMMISSURE POSTERIORI COMMISSURE MIDBRAIN C. REPTILE D. MAMMAL Fig. 365.âParietal and pineal organs of vertebrates as seen in median longitudinal section. A, cyclostome; B, anuran; C, reptile; D, mammal. Both parietal and pineal organs have served as median eyes. In amphibians it is the pineal organ, in reptiles the parietal organ. In man and mammals the pineal organ becomes a gland of doubtful funct
. Chordate anatomy. Chordata; Anatomy, Comparative. CORIUM ^EPIDERMIS PARIETAL NERVE PINEAL TRACT SUPERIOR HABENULAR' COMMISSURE â ^ MIDBRAIN iPOSTERIOR COMMISSURE. DORSAL SAC- SUPERIOR HABENULAR/ COMMISSURE POSTERIORI COMMISSURE MIDBRAIN C. REPTILE D. MAMMAL Fig. 365.âParietal and pineal organs of vertebrates as seen in median longitudinal section. A, cyclostome; B, anuran; C, reptile; D, mammal. Both parietal and pineal organs have served as median eyes. In amphibians it is the pineal organ, in reptiles the parietal organ. In man and mammals the pineal organ becomes a gland of doubtful function. (Redrawn from Oppel, after Studnicka.) The remaining parts of the adult eye are derived from mesenchyma. The cellular elements of the aqueous humor, and possibly also some of those of the vitreous body, are mesenchyme cells which enter the optic cup by way of the optic fissure. But the fact that fibers connect the lens and retina has led some investigators to infer that the vitreous body is derived from the retina and therefore is ectodermal. On the outside of the eye, the chorioid and fibrous tunics are added from the surrounding mesen- chyma. The eye muscles of man have a like origin, although in lower vertebrates they arise from the walls of the head "; Folds of skin form the eyelids, which unite temporarily but in man separate before 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son & Co.
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
