Carpenter's principles of human physiology . Section of Rabbits Liver injected:—e, bloodcapillaries; b, bile passages; n, nucleus of he-patic cell. epithelium, which in the medium-sized ducts remains columnar, passing in thesmaller ducts into the tessellated variety, suddenly becomes spheroidal, orassumes fhe form of the true secreting cell. The tubes, of the diameter of1—80th of an inch and larger, present many little saccular dilatations ofthe coats, the openings of which, according to Dr. Beale, are regularlyarranged in two rows or lines on opposite sides of the ducts ; and besidesthese are
Carpenter's principles of human physiology . Section of Rabbits Liver injected:—e, bloodcapillaries; b, bile passages; n, nucleus of he-patic cell. epithelium, which in the medium-sized ducts remains columnar, passing in thesmaller ducts into the tessellated variety, suddenly becomes spheroidal, orassumes fhe form of the true secreting cell. The tubes, of the diameter of1—80th of an inch and larger, present many little saccular dilatations ofthe coats, the openings of which, according to Dr. Beale, are regularlyarranged in two rows or lines on opposite sides of the ducts ; and besidesthese are numerous small, irregular, and anastomosing canals, which runobliquely in the coats of the ducts, and ultimately open into their cavities. states he has repeated Lehmanns experiments, and is unable to confirm them. He thinksthat there is no perceptible difference between Portal venous and Hepatic venous blood. THE LIVER. SECRETION OF BILE. 437 Fig. These tubes and caeca maybe regarded as accessory gall-bladders, in which theBile, secreted and stored up, comes into intimate relation with a fine plexus ofcapillaries, and may perhaps undergo further elaboration. In regard to themode of termination of the finest biliary ducts it appears from the observationsof Hering and others,* that, when injected, the canals existing between thelarge secreting cells form a close plexus (Fig. 175,a), the meshes of which appearto enclose the hepatic cells, though in reality the lines of injection follow thespaces between the large secreting cells (Beale). In the Eabbit these canalsrun exclusively, and in Man and the Dog in by far the greatest number, notalong the angles, but between the opposite surfaces (Fig. 176) of two adjacentcells, dividing their surfaces some-times into two equal halves andat others unequally. The bloodcapillaries (Fig. 176, c), on theother hand, chiefly run in theangles formed by the junction ofthree or more cells. According
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
