Identifier: textbookofphysio1916howe (find matches)
Title: A text-book of physiology : for medical students and physicians
Year: 1916 (1910s)
Authors: Howell, William H. (William Henry), 1860-1945
Subjects: Physiology Medicine
Publisher: Philadelphia and London : W. B. Saunders Company
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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n, like the liver and some other organs, contains specialenzymes (adenase, guanase, and xanthin oxydase), by whose actionthe split products of the nucleins may be converted to uric acid,and it is possible, therefore, that this latter substance may beformed in the spleen. * Grossenbacher and Asher, Zentralblatt f. Physiol, No. 12, 1908.f Consult Jones and Austrian, Zeitschrift f. physiol. Chem., 48, 110,1906. CHAPTER XLV. THE KIDNEY AND SKIN AS EXCRETORY ORGANS. Structure of the Kidney.—The kidney is a compound tubulargland. The uriniferous tubules composing it may be roughlyseparated into a secreting part comprising the capsule, convolutedtubes, and loop of Henle, and a collecting part, the so-called straightor collecting tube, the epithelium of which is assumed not tohave any secretory function. Within the secreting part the epithe-lium differs greatly in character in different regions; its peculiaritiesmay be referred to briefly here so far as they seem to have a physio- D F F _G_
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Fig. 298.—Portions of the various divisions of the uriniferous tubules drawn fromsections of human kidney: A, Malpighian body; x, squamous epithelium lining the cap-sule and reflected over the glomerulus; y, z, afferent and efferent vessels of the tuft; e,nuclei of capillaries; n, constricted neck marking passage of capsule into convoluted tu-bule; B, proximal convoluted tubule; C, irregular tubule; D and F, spiral tubules; E,ascending limb of Henles loop; G, straight collecting tubule— (Piersol.) logical bearing, although for a complete description reference mustbe made to works on histology. The arrangement of the glandular epithelium in the capsule withreference to the blood-vessels of the glomerulus is worthy of specialattention. It will be remembered that each Malpighian corpuscle con-sists of two principal parts, a tuft of blood-vessels, the glomerulus, andan enveloping expansion of the uriniferous tubule, the capsule. Theglomerulus is an interesting structure (see Fig. 298,

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