Human anatomy, including structure and development and practical considerations . sharply marked polygonal areas. In the human liver, on the con-trary, the interlobular connective tissue is present in small amount, the lobules, inconsequence, being pt)orlv detined and uncertain in outline. The Lobular Blood-Vessels.—Since the arrangement of the blood-vesselsis the salient feature in the architecture of the fully formed lobule, it is desirable tostudy the vascular distribution l)eft)re considering the disposition of the hepatic already describetl, the branches of the portal vein, the f
Human anatomy, including structure and development and practical considerations . sharply marked polygonal areas. In the human liver, on the con-trary, the interlobular connective tissue is present in small amount, the lobules, inconsequence, being pt)orlv detined and uncertain in outline. The Lobular Blood-Vessels.—Since the arrangement of the blood-vesselsis the salient feature in the architecture of the fully formed lobule, it is desirable tostudy the vascular distribution l)eft)re considering the disposition of the hepatic already describetl, the branches of the portal vein, the functional blood-vesselof the organ, ramify within the capsule of Glisson and encircle the periphery of thelobule ; inasmuch as these vessels supply the divisions of glandular tissue withblood for the performance of their secretory role, they correspond with the inter-lobular arterioles of ordinary glands. Numerous minute branches are given off from the interlobular ramihcations ofthe portal vein wdiich enter the periphery of the adjacent lobules and break up into Fig. 1445-. Portal vein Section of liver injected from hepatic vein, showing intralobular capillary net-work. X 100. the intralobular capillary net-work. The disposition of the latter is in generalradial, the capillaries converging towards the middle of the lobule, where they jointo form the central or intralobular vein, the beginning of the system of the hepaticveins by which the blood passing into the lobules is eventually carried into theinferior vena cava. The general course of the central vein corresponds to the longaxis of the lobule (Fig. 1444), and hence in cross-sections of the latter the veinappears as a trans\-ersely cut canal towards which the capillary \essels converge(Fig. 1445). The capillary net-ivork within the lobule is composed of channels with adiameter usually of about .010 mm. ; the widest capillaries—some .020 mm. indiameter—are found in the immediate vicinity of the afferent and eflferent
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
