Carpenter's principles of human physiology . uch derAnatomie, Band ii. 1866; Hiifher, Zur vergleich. Anat. u. Phys. d. , 1866. Ludwig, Art. Kidney, in Striekers Hum. and Comp. Histology, Transl., vol ii. 1872, pp. 83-109; Freys Histology, translated by Barker, , Allgemeine Anatomie, 1876, p. 237. Toldt, Geweblehre, 1877. Heidenhain,Schultzes Archiv, Band x. Heft. 1. Pouchet and Tourneux, Precis dHistologieHumaine, 1878, p. 701. 458 OF SECRETION AND EXCRETION. stance. This loop was first recognised by Henle, after whom it has beennamed the loop of Henle.
Carpenter's principles of human physiology . uch derAnatomie, Band ii. 1866; Hiifher, Zur vergleich. Anat. u. Phys. d. , 1866. Ludwig, Art. Kidney, in Striekers Hum. and Comp. Histology, Transl., vol ii. 1872, pp. 83-109; Freys Histology, translated by Barker, , Allgemeine Anatomie, 1876, p. 237. Toldt, Geweblehre, 1877. Heidenhain,Schultzes Archiv, Band x. Heft. 1. Pouchet and Tourneux, Precis dHistologieHumaine, 1878, p. 701. 458 OF SECRETION AND EXCRETION. stance. This loop was first recognised by Henle, after whom it has beennamed the loop of Henle. It is throughout narrower than the tortuous por-tion, but the recurrent limb of the loop (g, Fig. 181; b, Fig. 182) is wider thanthe descending limb (/, Fig. 181; c, Fig. 182). The latter portion is lined by-transparent pavement epithelium, the former by thicker, more granular, andcloudy epithelium, containing spherical nuclei. A short, rather tortuous por-tion of thetubuli (h, Fig. 181) succeeds, named the connecting canal.* Here Fig. Transverse section of the medullary substance of the kidney near the base ofa pyramidx350.—a, section of the large collecting tubes; b, section of theascending or recurrent limb of a loop of Henle; e, section of the descending limbof a loop of Henle, which differs from b in being smaller, and by its epitheliumbeing flatter; d, section of blood-vessels. the tubule widens again, and is lined by transparent cubical epithelium; con-tinuing to enlarge, it opens into one of the collecting tubes («, Fig. 181), whichjoins with another to form a larger one, and then again with another (c, Fig. 181),until by repeated junctions the large ducts of the papilla? are formed. Thecollecting tubes are lined by cubical epithelium, which gradually become morecolumnar with elliptical nuclei in the papillary tubes. The papillary ductshave a diameter of about l-80th to l-125th of an inch, but, at a distance otabout l-5th of an inch from the apex of the pyramid
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