THE KIDNEY 



181 



parts of its course. The details of these differences 

 are numerous and complicated, but the following state- 

 ment includes all that is most essential. The cells in 

 the convoluted, spiral and zigzag portions are, on the 

 whole, large, very granular and striated, and both the 



Fig. 54.— Diagrammatic View of the Course of the Tubules in 

 THE Kidney. 



r, cortical portion answering to Ct in Fig. 51, I- being close to the 

 surface of the kidneys ; g, p, medullary portion, p reaching to the 

 summit of the pyramid. 



IX, opening of tubule on the pyramid ; VIll, VII, VI, the straight 

 portion of the tubules ; V-II, the twisted portion of the tubules ; /, the 

 Malpighian capsule. 



cells and their nuclei stain readily and deeply. In the 

 collecting tubules the cells are flattened, cubical, quite 

 free from granules and do not stain readily. In the 

 loop of Henle the cells of the descending limb resemble 

 those in the collecting tubules in being flattened and 



