. Human physiology. Fig. 144.—Cross Section of a Lobule, magnified about 60 diameters. 1, intralobular vein ; 2, its smaller branches, collecting blood from the capillary network;3, interlobular branches of the portal vein, with their subdivisions passing inwards towardsthe capillary network in the substance of the lobule. The spaces between theblood-vessels of the liver arefilled with minute cells, aboutone-thousandth of an inch indiameter, called hepatic cellsor liver cells. The bloodcapillaries run between these,and all changes which occurin the blood as it circulatesthrough the liver are b
. Human physiology. Fig. 144.—Cross Section of a Lobule, magnified about 60 diameters. 1, intralobular vein ; 2, its smaller branches, collecting blood from the capillary network;3, interlobular branches of the portal vein, with their subdivisions passing inwards towardsthe capillary network in the substance of the lobule. The spaces between theblood-vessels of the liver arefilled with minute cells, aboutone-thousandth of an inch indiameter, called hepatic cellsor liver cells. The bloodcapillaries run between these,and all changes which occurin the blood as it circulatesthrough the liver are broughtabout by the action of thecells, which are separatedfrom the blood only by theexceedingly thin walls of thecapillaries. The materials whichare separated from theblood in the blood ca-pillaries appear to passthrough the liver cells toanother set of capillarieswhich are called the bilecapillaries. These unite. Fig. 145.—Diagrammatic Representation ofa Lobule in section. The section takesthe course of the intralobular vein. p, interlobular branches of the portal vein; h, intra-lobular branches of the hepatic vein ; s, sublobularvein. The arrows indicate the direction of the courseof the blood. The liver cells are represented in partonly. i58 ELEMENTARY PHYSIOLOGY to form small biliary ducts, which by their further union form the two larger ducts. One ofthese conveys the bilefrom the left lobe, andthe other from the right,while both unite to formtHe hepatic duct. Thegall-bladder is connectedwith this tube by a ductof its own, called thecystic duct (Gr. kustis, abladder), and these twounite into the commonduct, which leads directto the duodenum. The gall-bladder is apear-shaped bag, situatedon the under surface ofthe liver. It is supportedby the peritoneum, whichpasses below it; and itsbroader erid projects be-yond the front marginof the liver. The cysticduct is connected withthe narrow end.
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