. Text-book of embryology. Embryology. an pcu uu. 7TUU Fig. 192.—Development of veins in Petromyzon as seen from the ventral side. (After Goette, 1890.) , anterior cardinal vein; an, anastomotic vein ; , dnct of Cnvier; Kv, hepatic veins; li, outline of liver; , left vitelline vein; , posterior cardinal vein; , right vitelline vein; , subintestinal vein. Portions of the venous trunks which disappear during ontogeny are shown by dotted outlines ; the outline of the liver is shown in B by an interrupted line. This drains into a pair of lateral vitelline ve
. Text-book of embryology. Embryology. an pcu uu. 7TUU Fig. 192.—Development of veins in Petromyzon as seen from the ventral side. (After Goette, 1890.) , anterior cardinal vein; an, anastomotic vein ; , dnct of Cnvier; Kv, hepatic veins; li, outline of liver; , left vitelline vein; , posterior cardinal vein; , right vitelline vein; , subintestinal vein. Portions of the venous trunks which disappear during ontogeny are shown by dotted outlines ; the outline of the liver is shown in B by an interrupted line. This drains into a pair of lateral vitelline veins which unite in front to form the heart. Posteriorly the subintestinal vein bifurcates to pass on each side of the cloaca and then joins again to form the post-anal subintestinal vein. In its double cloacal portion, and also in front of this, wide communications pass between the subintestinal vein and the posterior cardinals. The ultimate fate of the sub- intestinal vein differs in its pre-cloacal and post-cloacal portions. The former loses its identity in that it becomes entirely resolved into portions of the vitelline network. The post-cloacal portion becomes converted into the caudal vein in the normal fashion as already described for Lepidosiren. It has already been mentioned that wide communications were established between the paired cloacal portion of the subintestinal vein and the posterior cardinals. With the breaking up of the pre-cloacal part of the vein the main. 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 MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology
