. On diseases of the liver. hliver, in which the bloodvessels are empty, as in an animal killedby bleeding. From the first specimen, we may learn the distribution of theminute portal and hepatic veins, and the intermediate annexed wood-cut (Fig. 1) has been made from a portion of theliver of a frog, which I selected from numerous specimens of injectedliver made by Mr. Bowman. It represents, on a magnified scale,a small branch of the hepatic vein, two or three small branches ofthe portal vein, and the intermediate capillaries. It appears thatthe capillaries have nearly the same
. On diseases of the liver. hliver, in which the bloodvessels are empty, as in an animal killedby bleeding. From the first specimen, we may learn the distribution of theminute portal and hepatic veins, and the intermediate annexed wood-cut (Fig. 1) has been made from a portion of theliver of a frog, which I selected from numerous specimens of injectedliver made by Mr. Bowman. It represents, on a magnified scale,a small branch of the hepatic vein, two or three small branches ofthe portal vein, and the intermediate capillaries. It appears thatthe capillaries have nearly the same relation to the branches of theportal vein as they have to those of the hepatic vein. It is difficult,from this specimen, to tell which branch is portal, which hepatic;the smaller branches of both being, as it were, hairy with capilla-ries, springing directly from them on every side, and forming aclose and continuous network. If we imagine views similar to that in the wood-cut, made by DISTRIBUTION OF ;r. 1. 21. a a, twigs of the portal vein ; d, twig of the hepatic vein ; 6, intermediate capillai slicing the liver in various directions through the branch of thehepatic vein, or through one of the branches of the portal vein,there represented, we shall perceive that the entire organ, abstract-ing the canals in which the trunk and branches of those veins run,is occupied by a close network of capillary bloodvessels, continu-ous in every direction throughout its substance. The capillaryvessels of this network are immediately concerned in vessels of larger size serve merely to convey the blood to them,or carry it from them. These capillaries are of comparatively large size, being alwaysone-third wider than the diameter of the blood-globule, and some-times nearly twice as wide, and their coats, which have no areolartissue about them, appear very thin and But although the capillaries form a continuous network through-out the substance of the liver
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Keywords: ., bookcentury1800, bookdecade1850, bookpublisherphila, bookyear1857
