424 



THE URINARY APPARATUS. 



Portion of tubule. 



Nature of epithelium. 



Position of tubule. 



Capsule 



First convoluted tube . 



Spiral tube 



Small or descending) 



tube of Henle. . . - ) 



Loop of Henle 



Larger or ascending \ 



tube of Henle. . . . J 



Zigzag tube 



Second convoluted tube 



Junctional tube . . . . 



Straight or collecting! 



tube j 



Duct of Bellini .... 



/ Flattened, reflected overglom-) 

 1 erulus. j 



f Cubical, fibrillated, the cells ) 

 \ interlocking. j 



Cubical, fibrillated (like the last). 



Clear flattened cells. 



Like the last. 



/Cubical, fibrillated, sometimes) | 

 t imbricated. j \ 



(Cells strongly fibrillated;) | 

 I varying height; lumen 

 ( small, 

 f Similar to first convoluted 



tube, but cells are longer, 

 <! with larger nuclei, and they 



have a more refractive as- 

 L pect. 



Clear, flattened, and cubical cells 



{Clear cubical and columnar) 

 cells. j 



Clear columnar cells. 



Labyrinth of cortex. 



Labyrinth of cortex. 



Medullary ray of cortex. 

 / Boundary zone and partly 

 I papillary zone of medulla. 



Papillary zone of medulla. 

 /Medulla and medullary ray 

 j of cortex. 



Labyrinth of cortex. 



Labyrinth of cortex. 



{Labyrinth passing to medul- 

 lary ray. 



Medullary ray and medulla. 

 Opens at apex of papilla. 



Blood-vessels. The renal artery (Fig. 238), which supplies the 

 kidney, is a branch of the abdominal aorta, which before entering 



a b 



FIG. 241. From section of cortical substance of human kidney : a, epithelium 

 of Bowman's capsule ; 6 and d, membrana propria ; c, glomerular epithelium ; e, 

 blood-vessels; /, lobe of the glomerulus; g, commencement of uriniferous tubule; 

 h, epithelium of the neck ; i, epithelium of proximal convoluted tubule ; X 240 

 (Bohm and Davidoff). 



