PHYSIOLOGICAL ANATOMY OF THE KIDNEYS. 



363 



present enlargements at irregular intervals in their course. The narrow por- 

 tions are about ^oVir ^ an i n h (12 yu.) in diameter, and the wide portions, 



FIG. 116. Struct ure of the kidney (Landois). 



I, blood-vessels and tubes (semi-diagrammatic). A, capillaries of the cortical substance ; B, capillaries 



of the medullary substance : 1. .artery penetrating a Malpighian body : 2, vein emerging from a 

 Malpighian body ; R, arteriolae rectsB ; c, venas rectae ; v, v, interlobular veins ; s, stellate veins ; 

 i, i. capsules of Muller ; x, x, convoluted tubes ; T, T, T. tubes of Henle ; N, N, N, N, communicating 

 tubes ; p, o, straight tubes ; O, opening into the pelvis of the kidney. 



II, Malpighian body. A, artery ; E, vein ; c, capillaries ; K, epithelium of the capsule ; H, beginning of 



a convoluted tube. 



III, rodded cells from a convoluted tube. 1, view from the surface ; 2, side view (G, granular zone). 



IV, cells lining the tubes of Henle. 



V, cells lining the communicating tubes. 



VI, section of a straight tube. 



about twice this size. The narrow portion is lined by small, clear cells 

 with very prominent nuclei. The wider portions are lined by larger, gran- 



