File:Carpenter's principles of human physiology (1881) (14595052689).jpg

Identifier: carpentersprinci00carp (find matches)
Title: Carpenter's principles of human physiology
Year: 1881 (1880s)
Authors: Carpenter, William Benjamin, 1813-1885 Meneses, Henry Power
Subjects: Human physiology Physiology
Publisher: London : J. & A. Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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EARLY STAGES OF THE DEVELOPMENT OF THE FOWL. 917 upper layer, constitute the intestinal tube.* At about the lGth hour athickening of the mesoblast occurs in front of the primitive groove, endingin front as the head fold (Fig. 333 B, Fig. 334). The surface of this ismarked by a groove (m c, Fig. 333), termed the medullary groove, the sidesof which constituting the medullary folds or laminae dorsales, graduallyarching over till they meet and fuse, enclose the medullary canal. Immediatelybeneath the groove the cells form a flattened cylindrical rod—the notochord,which is the precursor of the vertebral column (N.C., Fig. 334). Fig. 334. F.So.
Text Appearing After Image:
Fig. 335. Fig. 336. Diagrammatic Longitudinal Section through the Axis of an Embryo. F.So., Fold of the somato-pleure. F.Sp., Fold of the splanchnopleure. The line of reference, F.So., is placed in the lower bay,outside the embryo. The line of D is placed in the upper bay, inside the embryo; this will remainas the alimentary canal. Iioth folds (F.So., F.Sp.) are parts of the head fold, and are to be thoughtof as continually travelling onwards (to the left) as development proceeds, p p, Space betweensomatopleure and splanchnopleure or pleuro-peritoneal cavity. Am., Commencing (head) fold of tbeamnion. The tail fold has not yet appeared. N.C., Neural canal, closed in front, but as yet openbehind. The section being taken in the middle line, the protovertebrsa are of course not shown.In front of the notochord is seen a mass of uncleft mesoblast, which will eventually form part of theskull. D, Commencing foregut, or front part of the alimentary canal. A, Epiblast. B, Mesoblast.C, Hypoblast

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