. The development of the chick; an introduction to embryology. Birds -- Embryology. Fig. 135. — Circulation in the embryo and yolk-sac after 74 hours' incuba- tion. Stage of about 27 s from below. Injected. (After Popoff.) 1 Marginal vein. 2 r, 21, Right and left anterior vitelline veins sur- rounding the mesoderm-free area. 3, Anterior intestinal Portal. 4 In- termediate veins connecting with the venous network centrally. 5, Right dorsal aorta. 6, Posterior vitelline vein in process of formation. /, Vitel- line arteries. Note that the right anterior vitelline vein (2 r) is much Pl
. The development of the chick; an introduction to embryology. Birds -- Embryology. Fig. 135. — Circulation in the embryo and yolk-sac after 74 hours' incuba- tion. Stage of about 27 s from below. Injected. (After Popoff.) 1 Marginal vein. 2 r, 21, Right and left anterior vitelline veins sur- rounding the mesoderm-free area. 3, Anterior intestinal Portal. 4 In- termediate veins connecting with the venous network centrally. 5, Right dorsal aorta. 6, Posterior vitelline vein in process of formation. /, Vitel- line arteries. Note that the right anterior vitelline vein (2 r) is much 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 Lillie, Frank Rattray, 1870-1947. New York, Holt
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