THE URINARY ORGANS. 



169 



interstitial tissue with its capillaries and lymphatics will complete 

 the picture (Figs. 145 and 146). 



Fig. 145. 



Fig. 140. 



Sections from a rabbit's kidney, made perpendicular to the course of the straight tubules. 



Fig. 14").— Through a portion of the pyramid : a, lower portions of the collecting tubules 

 (excretory ducts) ; 6, Henle's loop in tangential section ; c, capillary bloodvessels ; d, 

 lymphatic ; e, descending limb of Henle's tube. 



Fig. 146.— Through part of a medullary ray and the adjoining labyrinth : a, a, a,a, convoluted 

 tubules in the labyrinth ; b, spiral tubule ; c, descending limb of Henle's tube ; d, ascend- 

 ing limb of Henle's tube: e, irregular tubule; /, collecting tubule; g, capillary blood- 

 vessel. 



The nerves of the kidney are small and apparently not abundant. 

 Their larger branches follow the courses of the arteries. 



