. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. Fig. 144. -Diagram of Section through: the Germ Area of a Mammal at Right Angles to the surface. e. Epiblast. i. Hypoblast. m. Mesoblast, or third layer. k. Cavity of the vesicle. lamince dorsales) bend over and ultimately meet together above, thus changing the groove into an elongated, hollow cylinder; the central cavity of which is the precursor of the canalis centralis, of the spinal cord, and of the third and fourth ventricles of the cerebro-. Fig. 145.—First appearance of the Emb
. The cat : an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. Fig. 144. -Diagram of Section through: the Germ Area of a Mammal at Right Angles to the surface. e. Epiblast. i. Hypoblast. m. Mesoblast, or third layer. k. Cavity of the vesicle. lamince dorsales) bend over and ultimately meet together above, thus changing the groove into an elongated, hollow cylinder; the central cavity of which is the precursor of the canalis centralis, of the spinal cord, and of the third and fourth ventricles of the cerebro-. Fig. 145.—First appearance of the Embryo, as shown by the Medullary Groove. In A the germinal area is pyriform, and the primitive groove occupies two-thirds of the narrow hinder end. In B the gioove is elongated, and th< middle line and line closely surrounding it indicates the rising up of the laminae dorsales or medullary plates on each side of it. In C the embryo is seeu somewhat expa1 ded towards each end. at. Transparent area. ao. Opaque area. mp. Medullary groove. spinal axis as well as of the iter between them—the enlargement at the cephalic end assuming the form of three successive dilatations or vesicles. Beneath the longitudinal groove a cellular rod becomes developed, extending forwards as far as the hinder end of the front cephalic vesicle and backwards to the end of the medullary groove. This rod is the notochord, or chorda dorsalis, and occupies the place of the future bodies of the vertebrae, the soft substance of the intervertebral discs of the adult being its persistent 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 Mivart, St. George Jackson, 1827-1900. New York : Scribner's
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