KIDNEYS. 



165 



voluted appearance. Throughout its structure are found numerous 

 small ovoid bodies, termed Malpighian corpuscles. 



FIG. 19. LONGITUDINAL SECTION THROUGH THE KIDNEY, THE PELVIS OF THE 

 KIDNEY, AND A NUMBER OF RENAL CALYCES. (Tyson, after Henle.) 



A. Branch of the renal artery. U. Ureter. C. Renal calyx, i. Cortex, if. 

 Medullary rays. i". Labyrinth, or cortex proper. 2. Medulla. 2'. Papil- 

 lary 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. 



The Uriniferous Tubules. The kidney is a compound, tubular 

 gland composed of microscopic tubules whose function it is to 

 secrete from the blood those waste products which collectively con- 



