Human physiology (1913) (14593168519)

Identifier: humanphysiology02luci (find matches)
Title: Human physiology
Year: 1913 (1910s)
Authors: Luciani, Luigi, 1842- Welby, Frances A. (Frances Alice) Camis, Marie Holmes, Gordon, Sir, 1876-1965 Pembrey, M. S. (Marcus Seymour), 1868-1934
Subjects: Physiology
Publisher: London : Macmillan and Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library



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laries, run towards the posterior surface of the liver, and openinto the inferior vena cava; and the lymphatics, which are largeand numerous in the liver, originating in the lymph sinuses roundthe portal capillaries, and which accompany and to a large extentenclose the branches of the blood-vessels, and leave by the portalfissure with the portal vein, the hepatic artery, and the bile orhepatic duct. This last leads by the cystic duct to the gall-bladder, and the junction of the two ducts (hepatic and cystic)form the common bile duct or ductus clioledoclius, which pours II EXTERNAL DIGESTIVE SECRETIONS 133 the bile into the duodenum during digestion, 7-10 cm. from thepylorus. By a special system of distribution, capillary formation, andreconstitution of these vessels, the hepatic parenchyma is dividedinto a number of lobules or acini varying in diameter from1 to 2 mm.—polyhedral or spheroid in shape,—which profoundlymodify the original tubular form of the gland. The branches of the
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Fn::. 4S.—Section of liver lobule, with blood-vessels and bile-ducts injected. (Cadiat.) I, I, inter-lobular veins ; a, intralobular vein ; c, interlobular bile-ducts, with which the bile canaliculiof the lobule are connected. The latter are only injected in the peripheral parts of thelobule. portal vein and hepatic artery penetrate as the interlobular veinsand arteries between the lobules, sending twigs to the interiorof the lobule which soon form a dense capillary network, fromwhich the intralobular veins re-form, and lead into a central vein(Fig. 48). The intralobular and central veins are the beginningof the efferent hepatic veins, which traverse the lobule in a radialdirection, and unite in the sublobular veins ; these form into largerand larger branches, converging towards the posterior surface ofthe liver, where they open, as we said, into the inferior vena cava. 134 PHYSIOLOGY CHAP. The interlobular course of the hepatic duct is similar to thatof the portal vein and the hepa