STRUCTURE OF THE KIDNEY 



193 



cortical substance, and an inner, or pyramidal, portion. In- 

 ternally the incision reveals a cavity into which the ureter 

 opens. This is the pelvis. 



y 



2" 



FIG. 54. Longitudinal section through the kidney, the pelvis of the 



kidney, and a number of renal calyces. 



(From Brubaker, after Tyson.) 



A, branch of the renal artery; U, ureter; C, renal calyx; i, cortex; i', medul- 

 lary rays; i", labyrinth, or cortex proper; 2, medulla; 2', papillary portion of 

 medulla, or medulla proper; 2", border layer of the medulla; 3, 3, transverse 

 section through the axes of the tubules of the border layer; 4, fat of the renal 

 sinus; 5, 5, arterial branches; *, transversely coursing medulla rays in column 

 of Bertin. 



Tracing the divisions of the pelvis toward the kidney sub- 

 13 



