. The elasmobranch fishes. Chondrichthyes. Fig. 136. The duodenum. A. Spinax niger. (From Eedeke.) 'B. Laemargus rostratus. (From Helbing.) , bile duct; , pyloric valve; py., pyloric stomach; sc.^~-, first and second blind sacs; spl., spleen. marks the region from which the liver and the pancreas arose in the embryo, the length of the ducts in the adult showing how far the two organs have ])e- come separated from their place of origin. LIVER The liver in the adult consists of a right and a left lobe, connected solidly an- teriorly as in Heptanchus (see fig. 119). From the posterior pa
. The elasmobranch fishes. Chondrichthyes. Fig. 136. The duodenum. A. Spinax niger. (From Eedeke.) 'B. Laemargus rostratus. (From Helbing.) , bile duct; , pyloric valve; py., pyloric stomach; sc.^~-, first and second blind sacs; spl., spleen. marks the region from which the liver and the pancreas arose in the embryo, the length of the ducts in the adult showing how far the two organs have ])e- come separated from their place of origin. LIVER The liver in the adult consists of a right and a left lobe, connected solidly an- teriorly as in Heptanchus (see fig. 119). From the posterior part of the union of the two lobes a caudate lobe may arise. In this or in either of the other lobes the gall bladder may be located. The main lobes of the liver are character- istically large in the sharks and may extend the entire length of the coelom. In some of the larger sharks (Cetorhinus) as much as five barrels of oil are reported to have been obtained from the liver of a single specimen. In the rays the lobes are less well developed, but here, too, they are often large. Bile secreted by the liver is collected by a series of tubules some of which empty into the gall bladder. The gall bladder is drained by a duct w^hich, joined with other ducts from the liver, is the ductus choledochus. This duct in Squalus sucklii (, fig. 137b) reaches the intestine at its proximal part. 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 Daniel, J. Frank (John Franklin), 1873-1942. Berkeley,Calif. , University of California press
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