Chap. XVII] 



SUMMARY 



339 



Location 



' Posterior part of lumbar region, behind peritoneum. 

 Placed on either side of spinal column and extend from 

 upper border of twelfth thoracic to third lumbar 

 vertebra. 



Q ^ 



Uriniferous 

 tubules 



Capsule and j Covered by tough envelope of fibrous tissue. 



supports \ Supported by quantity of fat, vessels, and peritoneum. 



Four inches long, two inches broad, one inch thick. 

 Weight, four and one half ounces (140 gm.). 

 Size and J Bean-shaped, tubular glands. 



shape 1 Concave side toward spine, convex side outward. 



Hilum — depression near centre of concave side serves 

 for vessels to enter and leave. 



Pelvis — Upper expanded end of ureter. 



Calyces — Cup-like cavities of the pelvis that receive 



papillae of pyramids. 

 Cortex — ■ outer, lighter, more solid portion. 

 Medulla — inner, darker, striated portion. 



' Begin as hollow globes or capsules in the 

 cortex of kidney, and after a very ir- 



{ regular course open into straight col- 

 lecting tubes which pour their contents 

 into calyces of pelvis. 



Cone-shaped masses in the medullary 

 portion of the kidney. Vary in num- 

 ber from 8-12. 

 Anatomy Bases directed toward cortex. 



of the i Pyramids < Papillae — Apices of the pyramids, di- 

 kidney rected toward pelvis. 



Consist of uriniferous tubules, blood- 

 vessels, and l}Tnphatics, held together 

 by connective tissue. 



(Minute tufts of capillaries — glomeruli 

 — in the cortical portion of kidneys 

 which are surrounded by inverted cap- 

 sule of uriniferous tubule. 



' Renal artery — direct from aorta. 

 Enters hilus of kidney, divides into many 

 branches. 



C Lateral branches at the level of 

 the base of the pyramids. 



Blood 

 supply 



Arterial 

 arches 



1. Send branches to cortex 

 (cortical) . 

 . 2. Send branches to pyramids. 



