Analysis of the urine . pening to a wider tube, which, after many windings,runs toward the medulla. When, as a wide, convolutedtube, it has reached the boundary, it suddenly becomesof less calibre, and as a narrow canal penetrates moreor less deeply into the medulla; here the descendingstraight tube turns on itself, forming a narrow loop(Henles loop), and runs directly upward toward andinto the cortex. On reaching the cortex the canal doesnot seek the place of its origin, but avoids it and runsalongside the nearest medullary ray. Sooner or later itloses its straight direction, and with several
Analysis of the urine . pening to a wider tube, which, after many windings,runs toward the medulla. When, as a wide, convolutedtube, it has reached the boundary, it suddenly becomesof less calibre, and as a narrow canal penetrates moreor less deeply into the medulla; here the descendingstraight tube turns on itself, forming a narrow loop(Henles loop), and runs directly upward toward andinto the cortex. On reaching the cortex the canal doesnot seek the place of its origin, but avoids it and runsalongside the nearest medullary ray. Sooner or later itloses its straight direction, and with several convolutionspasses as a widened tube (tubulus contortus) among thecurved canals of the labyrinth. From there it turnsand enters one of the tubes of a medullary ray (Bellinistubes), the convexity of its curve directed toward the 22 ANALYSIS OF TEE URINE. surface of the kidney, thus losing its independent latter occurs as follows: Several canals run fromdifferent directions to the same place and become blended. Fig. 2.—p, Papilla, g, Boundary, r, Cortex. I, Capsula glomeruli. II, Convo-luted portion of tubule passing into III, descending branch of Henlesloop, h, Henles loop. IV, Ascending branch of Henles loop. V, Con-voluted portion of tubule joining VI, tubulus Bellinianus. VII, Anothertubulus Bellinianus. VIII, Common duct. IX, Ductus papillaris. into a straight wide tube (tubulus Bellinianus, Fig. 2) :this runs a direct course until it reaches the papillarypart of the medulla, where it unites with a neighboring * The quotations are from C Ludwig. See Striekers Handbook of Histology. HISTOLOGY OF TEE URINARY ORGANS. 23 tube and so continues (Fig. 2, VIII.) until the unitedtubes, as the so-called ductus papillaris, empty into oneof the calices. The wall of the capsula Malpighii is made up of amosaic of cells. The glomerulus is not directly sur-rounded by the fluid contents of the capsule, this beingprevented by a layer of nucleated cells not easily de-fined, which
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