. The comparative anatomy of the domesticated animals. Veterinary anatomy. TRANSVERSE SECTION OF THE EMBRVO OF A FOWL AT THE BEGINNING OF THE THIRD DAY OF INCUBATION, X 90-100. ch, Chorda dorsalis; wwh, position of a thinning, or cavity in the protoverte- bral mass, dividing it into an anterior and posterior portion; hp, parietal lamina; df, intestinal fibrous lamina; dd, intestinal glandular lamina; dr, primitive intestinal groove; A, corneal lamina j mr, medullary tube (spinal cord); m, muscular lamina; /), pleuro- peritoneal cavity; af, fold of the amnion ; ao, primitive aorta; t)C, vena ca
. The comparative anatomy of the domesticated animals. Veterinary anatomy. TRANSVERSE SECTION OF THE EMBRVO OF A FOWL AT THE BEGINNING OF THE THIRD DAY OF INCUBATION, X 90-100. ch, Chorda dorsalis; wwh, position of a thinning, or cavity in the protoverte- bral mass, dividing it into an anterior and posterior portion; hp, parietal lamina; df, intestinal fibrous lamina; dd, intestinal glandular lamina; dr, primitive intestinal groove; A, corneal lamina j mr, medullary tube (spinal cord); m, muscular lamina; /), pleuro- peritoneal cavity; af, fold of the amnion ; ao, primitive aorta; t)C, vena cardinalis; un, Wolffian body ; ung, duct of the Wolffian LONGITUDINAL SECTION OF THE EYE OF EMBRYO FOWL. 1, From an embryo at about the sixty-fifth hour of incubation; 2, from an embryo a few hours older; 3, from an embryo at the fourth day of incubation, h, Corneal lamina; /, lens in fig. 1, still connected with the corneal lamina, and possessing a small cavity, o, in its interior (in figs. 2 and 3 it is seen detached, but still hollow); r, introverted portion of the primitive optic vesicle, subsequently becoming the retina ; a, posterior j>art of the optic vesicle, which, according to Remak, probably becomes the choroid coat, ciliary processes, and iris, and in figs. 1 and 2 is still connected with the brain by the hollow optic nerve; x, thickening of the corneal lamina around the spot from which the lens has detached itself; gl, vitreous body, or humour. The great sympathetic is early seen as a nodulated cord. It is probably de- veloped in the same manner as the other nerves. Development of the Organs of Sense. The principal portion of the organs of sense belong to the dependencies of the nervous system, and are developed with it; the other parts belong to the external epithelial lamina, the skin, and the germinative lamina. 1. Visual Apparatus.—From the anterior cerebral vesicle are given off two tubular prolongations, which are directed forward, and terminate by
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