. The anatomy of the human body. Human anatomy; Anatomy. THE LIVER. 395 by which very small veins open directly into them. Their ramifications are much less numerous than those of the vena portse. The result of the injections described above also explains the difTerence in colour be- tween the centre and the circumference of each granule ; it shows, moreover, that one part of the granule is impermeable to injections ; and its spongy nature, resembling that of the pith of the rush or elder, is apparent even to the naked eye, in a section of a liver thus injected, when viewed by a strong light.
. The anatomy of the human body. Human anatomy; Anatomy. THE LIVER. 395 by which very small veins open directly into them. Their ramifications are much less numerous than those of the vena portse. The result of the injections described above also explains the difTerence in colour be- tween the centre and the circumference of each granule ; it shows, moreover, that one part of the granule is impermeable to injections ; and its spongy nature, resembling that of the pith of the rush or elder, is apparent even to the naked eye, in a section of a liver thus injected, when viewed by a strong light. To resume, then, it may be said that the liver is composed of ovoid, elliptical, or, rath- er, polyhedral granules, moulded closely upon each other. Each granule has its proper fibrous capsule; and all the capsules are united together by prolongations, which also connect them with the general cellular investment of the liver, and with that extension of it called the capsule of Ghsson. The granules are independent of each other. Each of them consists of a spongy tissue, impermeable to injections ; of a biliary duct proceed- ing from its centre ; of a venous network formed by the hepatic veins ; of another ve- nous network belonging to the vena portae ; and of a very delicate arterial network deri- ved from the hepatic artery, which is ramified upon the parietes of the vena portae and biliary ducts. Such is the structure of the hver.* It remains for me now to examine its excretory apparatus. The Excretory Apparatus of the Liver. The excretory apparatus of the liver consists of the hepatic duct, of the cystic duct, of the gall-bladder, and of the ductus communis choledochus. The hepato-cystic canals,! admitted by some authors as constant or occasional in man, can be easily shown in the lower animals, but do not exist in the human species. The Hepatic Duct.—The hepatic duct arises in the granules of the liver by hepatic rad- iclesjt which, by uniting successively like veins, cons
Size: 2025px × 1234px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
