. The elements of embryology. Embryology; Embryology. 354 EMBRYONIC MEMBRANES AND YOLK-SAC. [CHAP. close, and the placenta is truly decidiiate. The cavity of the allantois persists till birth. Between the yolk-sac, the allantois, and the embryo, there is left a large cavity filled with an albumi- nous fluid. Fig. 116.. Diagrammatic Longitudinal Section of a Rabbit's Ovum AT AN Advanced Stage of Pregnancy. (From Kolliker after Bischoflf.) e. embryo; a. amnion; a. urachus ; al. allantois with blood- vessels ; sh. sub-zonal membrane; pi. placental villi; fd. vascular layer of yolk-sac; ed. hypobl
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. The elements of embryology. Embryology; Embryology. 354 EMBRYONIC MEMBRANES AND YOLK-SAC. [CHAP. close, and the placenta is truly decidiiate. The cavity of the allantois persists till birth. Between the yolk-sac, the allantois, and the embryo, there is left a large cavity filled with an albumi- nous fluid. Fig. 116.. Diagrammatic Longitudinal Section of a Rabbit's Ovum AT AN Advanced Stage of Pregnancy. (From Kolliker after Bischoflf.) e. embryo; a. amnion; a. urachus ; al. allantois with blood- vessels ; sh. sub-zonal membrane; pi. placental villi; fd. vascular layer of yolk-sac; ed. hypoblastic layer of yolk- sac ; ed'. inner portion of hypoblast, and ed". outer portion of hypoblast lining the compressed cavity of the yolk-sac; ds. cavity of yolk-sac; st. sinus terminahs; r. space filled with fluid between the amnion, the allantois and the yolk- The metadiscoidal type of placenta is found in Man and the Apes. The placenta of Man may be con- veniently taken as an example of this type.. 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 work.. Foster, M. (Michael), Sir, 1836-1907; Balfour, Francis M. (Francis Maitland), 1851-1882; Sedgwick, Adam, 1854-1913; Heape, Walter, 1855-1929. London : Macmillan and Co.