The elements of Embryology (1889) The elements of Embryology elementsofembryo00fostuoft Year: 1889 vt vt — Fig. 9, ^ to iV forms a series of purely diagrammatic repre- sentations introduced to facilitate the comprehension of the manner in which the body of the embryo is formed, and of the various relations of the yolk-sac, amnion and allantois. In all vt is the vitelline membrane, placed, for convenience sake, at some distance from its contents, and represented as per- sisting in the later stages; in the actual egg it is in direct contact with the blastoderm (or yolk), and early cease
The elements of Embryology (1889) The elements of Embryology elementsofembryo00fostuoft Year: 1889 vt vt — Fig. 9, ^ to iV forms a series of purely diagrammatic repre- sentations introduced to facilitate the comprehension of the manner in which the body of the embryo is formed, and of the various relations of the yolk-sac, amnion and allantois. In all vt is the vitelline membrane, placed, for convenience sake, at some distance from its contents, and represented as per- sisting in the later stages; in the actual egg it is in direct contact with the blastoderm (or yolk), and early ceases to have a separate existence. In all e indicates the embryo, j)p the general pleuro- peritoneal space, af the folds of the amnion proper ; ae or ac the cavity holding the liquor amnii ; al the allantois ; d the ali- mentary canal; y ov ys the yolk or yolk-sac. A, which maybe considered as a vertical section taken longi- tudinally along the axis of the embryo, represents the relations of the parts of the egg at the time of the first appearance of the head-fold, seen on the right-hand side of the blastoderm e. The
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