. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. NORMAL ANATOMY OF THE LIVER. 169 Fig. Two lobules, in which the portal venous plexus is seen. After Kiernan. a a, Interlobular veins. The appearance of venous circles formed by these veins is that which is afforded by a common lens ; when examined with a higher power the interlobular fissure is seen to be filled by a vascular plexus, b, The lobular venous plexus. The circular and ovoid spaces seen be- tween the branches of the plexuses are occupied by portions of the biliary plexus : they are the acini of Malpighi.
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. NORMAL ANATOMY OF THE LIVER. 169 Fig. Two lobules, in which the portal venous plexus is seen. After Kiernan. a a, Interlobular veins. The appearance of venous circles formed by these veins is that which is afforded by a common lens ; when examined with a higher power the interlobular fissure is seen to be filled by a vascular plexus, b, The lobular venous plexus. The circular and ovoid spaces seen be- tween the branches of the plexuses are occupied by portions of the biliary plexus : they are the acini of Malpighi. c. The intralobular vein in the centre of each lobule, collecting the blood from the lobu- lar venous plexus. The hepatic duct bifurcates in the transverse fissure into two branches, which enter the right and left lobes of the liver and subdivide into smaller branches, and the smaller branches accompany the divisions of the portal vein and hepatic artery through the portal canals to their ultimate distribution in the lobules. The branches of the hepatic duct, like those of the portal vein, are divisible into the vaginal, inter- lobular, and lobular ducts. The vaginal ducts pass transversely through the capsule of Glisson, by which they are enve- loped in common with the portal vein and hepatic artery, and divide into numerous small branches which assist in forming the vaginal plexus. From the plexus of ducts two kinds of branches are given off, the interlobular, which run along the margins of the interlobular fissures and enter the interlobular spaces to be distributed upon the capsular surfaces of the lobules ; and the lobular, which enter the sub- stance of those lobules which form the parietes of the portal canals. In the smaller portal canals the vaginal branches and plexus are situated only on the portal side of the canal, the interlobular branches, on the side nearest the duct, passing directly into the interlobular spaces. " The transverse branches and those which
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