316 



THE URINARY APPARATUS 



called the medulla, measuring f to f of an inch in 

 thickness; and an outer one-third called the cortex, 

 measuring J to J inch in thickness. 



Fio. 115 



COLUMN OF 



BERTIN 



MEDULLARY 

 PYRAMID 



URETER 



MEDULLARY 



PYRAMID 



COLUMN OF 



BERTIN 



Vertical section of kidney, showing the secreting portion, the vessels, 

 and the beginnings of the ureter. (Testut.) 



The Medulla. This consists of small pyramids, 

 ten to twenty in number. The base of each is 

 directed toward the cortex and the apices point 

 toward the pelvis of the ureter, where they project 

 into the calices of the same; each calix receives one, 



