. Text-book of normal histology: including an account of the development of the tissues and of the organs. their primitive type of the tubular glandthe bile-capillaries appear as minuteducts placed centrally within the cordsof the hepatic cells, the biliary passagesrepresenting lumina of tubular acinilined with secreting glandular epithe-lium. In man, however, the liver-cellsare usually bordered on all sides, ex-cept on that lying next the blood-vessels, by the deHcatebile-canaliculi,the latter never interposing betweenthe cells and the blood-channels. The bile-capillaries exist as narrow(1-2
. Text-book of normal histology: including an account of the development of the tissues and of the organs. their primitive type of the tubular glandthe bile-capillaries appear as minuteducts placed centrally within the cordsof the hepatic cells, the biliary passagesrepresenting lumina of tubular acinilined with secreting glandular epithe-lium. In man, however, the liver-cellsare usually bordered on all sides, ex-cept on that lying next the blood-vessels, by the deHcatebile-canaliculi,the latter never interposing betweenthe cells and the blood-channels. The bile-capillaries exist as narrow(1-2 /-t) clefts between adjacent liver-cells, maintaining about the samediameter throughout the lobule ; at the periphery the intercellularchannels pass into the larger, though still small, interlobular bile-ducts. The hepatic cells between which the bile-capillary takes itscourse become replaced at the periphery of the lobule by the lowepithelium of the bile-duct, the basement-membrane present in thelatter fading away into the delicate connective tissue holding togetherthe cords of liver-cells. Fig. Section of liver of frog, exhibiting tubu-lar character of gland : a, blood-channelscontaining corpuscles ; b, lumina of hepaticcylinders which correspond to bile-capil-laries ; c, pigment-cell. i8o NORMAL HISTOLOGY. Fig. 224. The of a distinct independent wall to the bile-capillarieshas been the subject of much conflicting testimony ; according to some, these vessels are with-out distinct walls of theirown, while other authoritiesregard the existence of a deli-cate special wall consisting of^-v^w Y=>.gf/Y . r/^ij;-jr ^^.,-_ - a homogeueous structureless\J^A C/^y^^T^V^YAXl^^^ membrane as established. ^ ^ ■ The presence of a distinct membranous wall seems ques-tionable ; when it is recalledthat the bile-capillaries reallyrepresent lumina of modi-fied tubular glands, thereseems to be no greater neces-sity for or probability of theexistence of a membrane tolimit the
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphiladelphiajblipp
