Quain's elements of anatomy . CANAL, &c. tion of the festal liver in the abdomen is more symmetrical than in the adult. Inthe very young foetus it extends over nearly the whole of the abdominal cavity ;at the full period it stUl descends an inch and a half below the margin of thethorax, overlaps the spleen on the left side, and reaches nearly down to thecrest of the ilium on the right. Form, Colothv, Sfo.—The foetal liver is considerably thicker in proportion fromabove downwards than that of the adult. It is generally of a darker hue. Itsconsistence and specific gravity are both less than in t
Quain's elements of anatomy . CANAL, &c. tion of the festal liver in the abdomen is more symmetrical than in the adult. Inthe very young foetus it extends over nearly the whole of the abdominal cavity ;at the full period it stUl descends an inch and a half below the margin of thethorax, overlaps the spleen on the left side, and reaches nearly down to thecrest of the ilium on the right. Form, Colothv, Sfo.—The foetal liver is considerably thicker in proportion fromabove downwards than that of the adult. It is generally of a darker hue. Itsconsistence and specific gravity are both less than in the adult. During foetal life, the umbilical vein runs from the umbilicus along the freemargia of the suspensory ligament towards the anterior border and under surfaceof the liver, beneath which it is lodged in the umbilical fissure, and proceeds asfar as the transverse fissure. Here it divides into two branches ; one of these, theductus venosus, continues onward in the same direction, and joins the vena cava. Fig. Fig. 792. — Early con-dition OP THE LIVERIN THE CHICK ON THETHIRD DAT OF INCU-BATION (from J. Miil-ler). Lo. 1, the heart as a sim-ple curved tube ; 2, 2,the intestinal tube ; 3,conical protrusion of thecoat of the commencingintestine, on which theblastema of the liver (4)is formed ; 5, portion ofthe layers of the germinalmembrane, passing intothe yolk-sac. The other, which is the larger branch (the trunk of the umbilical vein), turns tothe right along the transverse or portal fissure, and ends in the vena portffi,which, proceeding from the veins of the digestive organs, is in the foetus com-pai-atively of small dimensions. The umbilical vein, as it lies in the umbilicalfissure, and before it joins the vena porta3, gives off large lateral branches, whichpass directly into the right and left lobes of the liver. It also sends a few smallerbranches to the square lobe and to the lobe of Spigelius. After bhth the umbilical vein becomes obliterated from the umbili
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