. The American journal of anatomy. sections shown in figures 44 and 45. The larger vasculartrunks ofthe liver in Mustelus and Torpedo are mapped out by the growthof the hepatic cylinder network between them. As in Acanthiasthe main liver veins are marked out early in the developmentof the organ, and are not formed by the fusion of smaller vascularspaces. In both the forms under discussion and in Acanthias thehepatic sinusoids are formed by the intercresence of the hepaticcylinders and the omphalo-mesenteric veins. In Mustelus andTorpedo this intercresence is due to the invasion of the spaceocc
. The American journal of anatomy. sections shown in figures 44 and 45. The larger vasculartrunks ofthe liver in Mustelus and Torpedo are mapped out by the growthof the hepatic cylinder network between them. As in Acanthiasthe main liver veins are marked out early in the developmentof the organ, and are not formed by the fusion of smaller vascularspaces. In both the forms under discussion and in Acanthias thehepatic sinusoids are formed by the intercresence of the hepaticcylinders and the omphalo-mesenteric veins. In Mustelus andTorpedo this intercresence is due to the invasion of the spaceoccupied by the vein. In Acanthias, in early stages, the inter-cresence is due to the penetration of the venous sprouts aboutthe tubules which are already established. In later stages inAcanthias the cylinders increase by growing into venous spacesand the end result in either case is the same. Thus both themethods of sinusoid development postulated by Minot (00) andby Lewis (04) are found in these forms. HISTOGENESIS OF THE LIVER 293.
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