. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 208 TEXT-BOOK OF EMBRYOLOGY. ticulura in a human embryo of 3 mm. The single diver- ticulum 1 very speedily bifurcates at its distal extremity (Fig. 97). The very short time that elapses between the first appearance of the evagination and its division into two branches explains the statement made in some text-books that two diverticula are present from the first. The hepatic diverticulum is said to grow into the septum transversum (vide Development of the Diaphragm, p. 174). The dorsal part of th
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 208 TEXT-BOOK OF EMBRYOLOGY. ticulura in a human embryo of 3 mm. The single diver- ticulum 1 very speedily bifurcates at its distal extremity (Fig. 97). The very short time that elapses between the first appearance of the evagination and its division into two branches explains the statement made in some text-books that two diverticula are present from the first. The hepatic diverticulum is said to grow into the septum transversum (vide Development of the Diaphragm, p. 174). The dorsal part of the septum transversum or primitive diaphragm, the region just ventral to the bowel, contains a mass of young connective tissue, rich in cells and blood-vessels, which has been designated the prehepaticus, and the liver-ridge, by His and Kolliker respectively (Fig. 90). It is into this vascular and cellular mass that the liver diverticulum inserts itself. The septum transversum is united in the median plane of the body with the ventral mesentery, and since the ventral mesentery is connected with the region of the intestine from which the hepatic diverticulum is evaginated, the latter passes between the two layers of the mesentery to reach the liver- ridge (Fig. 102). This fact con- stitutes the key to the topo- graphical relations of the liver and its peritoneal "ligaments," as will appear hereafter. The two diverticula resulting from the division of the original single evagination embrace be- tween them the two vitelline veins, and by repeated branch- ing produce the right and the left lobes of the liver. Before branching, the diverticula become greatly thickened at their distal extremities by 1 Single, according to His, Kolliker, Hertwig, Minot, and Fig. 102.—Diagram to show the original positions of the liver, stomach, duodenum, pancreas, and spleen, and the ligamentous appa- ratus pertaining to them. The organs are seen in longitudinal section : I, liver
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