File:A text-book of human physiology (1906) (14747415176).jpg

Identifier: textbookofhumanp00tige (find matches)
Title: A text-book of human physiology
Year: 1906 (1900s)
Authors: Tigerstedt, Robert, 1853-1923 Murlin, John R. (John Raymond), b. 1874, tr
Subjects: Physiology
Publisher: New York and London, D. Appleton and Co.
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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dles of urinarj- tubules in thepyramids. The radial arteries send out small branches, vosa afferentia, which soon breakup in the so-called glomeruli of the Malpighian corpuscles presently to be THE EXCRETION OF URIXE 385 described. From these, a new vessel, the vas efferens, arises and this in its turnbreaks up into a capillary network which embraces the kidney tubules. Thosevasa efferentia which belong to the deeper layers of the cortex push down into the outer layer of the medulla, and from here runbetween the renal tubules and break up into tuftsof vessels, whence again proceed capillaries to thetubules. From the capillaries of the renal cortex theblood collects in venous trunks which run parallelwith the radial arteries to the outer layer of themedulla, and like them foi*m an anastomosingnetwoik at the base of the pyramids. Into this o ;0o o ^rp O ,7i« \- n\ Fig. 143.—Schema rcpre.sent-ing the distribution of theblood vessels of the kidney,after Ludwig. Arteries red,veins blue.
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Fig. 144.—Schematic representations of the secretingand conducting elements of the kidney, after I.udwig.7, Bowmans capsule; //, first convoluted tubule;HI, IV, Henles loop; F, second convoluted tubule;y/,collecting tubule; r, cortex; g, medulla; p, papilla. network empty the veins from the medullaiy substance, which, like thearteries, run in the interstices between the renal tubules and converge formingtufted groups. The qlomeruhis interpolated between the vas afferens and the vas efferenshas the following structure. The afferent arteriole breaks up into several 386 THE EXCRETIONS OF THE BODY branches, each of which by repeated divisiim forms a lobule composed of sev-eral collateral vessels. These vessels do not anastomose, but unite finally toform a simple vas efferens, the beginning of which lies in the middle of theglomerulus. They have a simple wall and hence are to be regarded as capillaries.In the kidney therefore the blood passes through two sets of capillaries, one inthe gl

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