HISTOLOGY. 



Ill 



SCHEME OF URINIFEROUS TUBULES AND GLOM- 

 ERULI. 



], afferent artery; 2, efferent vein; 3, glomerulus; 4, 

 neck of the uriniferous tubule; 5, proximal convoluted tu- 

 bule; 6, spiral tubule; 7, descending limb of Henle's loop; 

 8, Henle's loop; 9, ascending limb of Henle's loop; 

 10, spiral portion of the ascending limb; 11, zigzag tubule; 

 12, distal convoluted tubule; 13, straight collecting tubule. 



leaves the glomerulus at the opposite pole from the 

 artery and vein. The uriniferous tubule takes a tortu- 

 ous course and has received names accordingly: I, the 

 neck, lined with low cuboidal epithelial cells; 2, the 

 convoluted tubule, lined . with low columnar cells ; 3, 

 the spiral tubule, lined with the same as No. 2; 4, the 

 descending limb of Henle, lined with squamous cells; 



