Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . Fig. 338.—Ideal section of an embryo somewhat younger than that offig. 339. A, transverse section ; a, vitelline membrane ; b,b, laminae dorsaleset vertebrales; b-, b~, laminae abdominales and transverse processes; c,c,lamina mucosa, which is seen bending round under the chorda dorsalis (e),to form the intestinal canal; d, d, lamina vasculosa; /, /, peripheral por-tion of the lamina serosa, proceeding to form the lateral involucra and the
Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . Fig. 338.—Ideal section of an embryo somewhat younger than that offig. 339. A, transverse section ; a, vitelline membrane ; b,b, laminae dorsaleset vertebrales; b-, b~, laminae abdominales and transverse processes; c,c,lamina mucosa, which is seen bending round under the chorda dorsalis (e),to form the intestinal canal; d, d, lamina vasculosa; /, /, peripheral por-tion of the lamina serosa, proceeding to form the lateral involucra and theamnion ; g, medulla spinalis.—B, longitudinal section; a, vitellary mem-brane ; b, lamina serosa, and dorsum of the embryo ; b~, head of theembryo ; c, c, lamina mucosa ; d, lamina vasculosa; d2, heart; d3, branchialarteries ; c?4, aorta ; d5, artery of the blastoderma (arteria vitellina). DEVELOPMENT OF THE CHICK SECOND PEEIOD. 309 history of the development, as, from the general vigour of theformative processes, all the organs now begin to be evolved,. Fig. 339.—View of an embryo, four lines long, magnified about eightdiameters. The embryo is seen from the abdominal surface ; the time isthe middle of the third day. a, Area pellucida ; b, anterior cerebral cell(the hemispheres) ; c, cell of the thalami and crura cerebri; d, corporaquadrigemina; e, cerebellum and medulla oblongata; /, the eye, a widecleft inferiorly; g, the auditory vesicle lying in front of the medullaoblongata ; h, h, h, vertebral lamina; i, ventricle of the heart; k, atriumcordis ; kl, superior, and £2, inferior vein of the blastoderma ; I, bulb ofthe aorta, giving off the four branchial arteries, over which lie threebranchial arches, 1, 2, 3 ; m, m, arteries of the blastoderma proceedingfrom the divided trunk of the aorta ; inwards from either aorta the bodiesof the vertebral laminae are united by suture; ?z, the allantois justbudding forth ; o, o, o, o, margins of the abdominal cavity, reflected su.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
