THE URINARY ORGANS. 



161 



interstitial tissue with its capillaries and lymphatics will complete 

 the picture (Figs. 137 and 138). 



FIG. 138. 



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



Fig. 137. 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. 138. Through part of a medullary ray and the adjoining labyrinth : a, a, a, a, convoluted 

 tubules in the labyrinth ; 6, 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. 

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