. The development of the chick; an introduction to embryology. Birds -- Embryology. THE B0DY-CA\'ITIE8 335 the heart and Uver, (b) a median portion comprising the sinus venosus, ductus venosus and Uver, and (c) an inferior portion. Tlie superior part persists in the region of the sinus venosus and Uver, and the inferior part only as the primary ventral ligament of the liver. The median mass of the septum transversum thus includes the sinus venosus, liver, and dorsal and ventral ligaments of the liver. At sixty hours the median mass includes chiefly the sinus and ductus venosus and their mesent
. The development of the chick; an introduction to embryology. Birds -- Embryology. THE B0DY-CA\'ITIE8 335 the heart and Uver, (b) a median portion comprising the sinus venosus, ductus venosus and Uver, and (c) an inferior portion. Tlie superior part persists in the region of the sinus venosus and Uver, and the inferior part only as the primary ventral ligament of the liver. The median mass of the septum transversum thus includes the sinus venosus, liver, and dorsal and ventral ligaments of the liver. At sixty hours the median mass includes chiefly the sinus and ductus venosus and their mesenteries. At eighty hours (Fig. 192) a constriction begins to appear between sinus and. Fig. 192. — Reconstruction of the septum transversum and associated mesenteries of a chick embryo of 80 hours. (After Ravn.) Ao., Aorta. Int., Intestine. Liv., Liver. PI. m'g., Plica mesogastrica. , Sinus venosus. ductus venosus, and the walls of the latter are expanded by the formation of liver tissue, so that the cylindrical form charac- teristic of sixty hours is lost, and the lateral walls of the ductus venosus bulge considerably. The continued growth of the liver causes a rapid lateral expansion of this portion of the septum transversum (Fig. 193 A). The primary ventral ligament of the liver is included Avithin the wall of the anterior intestinal portal up to about eighty hours. But, as the yolk-sac shifts farther back, this ligament appears as a separate membrane (inferior part of the primary ventral. 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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