THE KIDNEYS. 



387 



tion for a short distance and divides ; each branch then 

 proceeds in a straight direction and divides ; and thus, 

 a single tubule at the apex of the pyramid will have 



13. Straight part of col- 

 lecting tube. 

 9. Wavy part of as- 

 cending limb of 

 Henle's loop. 



Inner stratum of cor- 

 tex without Mal- 

 pighlan corpuscles. 



7 and 8. Ascending 

 limb of Henle's 

 loop tube. 



15. Tubule of Bellini. 



Snbcapsular layer with- 

 out Malpighian cor- 

 puscles. 



12. First part of col- 

 lecting tube. 



11. Distal convoluted 

 tubule. 



A. CORTEX. 



10. Irregular tubule. 



3. Proximal convo- 

 luted tubule. 



9. Wavy part of as- 

 cending limb. 



2. Constriction or 

 neck. 



4. Spiral tubule. 

 1. Malpighian 



surrounded 



tuft 

 by 



Bowman's capsule. 



8. Spiral part of as- 

 cending limb of 

 Henle's loop. 



B. BOUNDARY ZONE. 

 5. Descending limb of 

 Henle's loop tube. 



6. Henle's loop. 



.0 C. PAPILLARY Zoxz. 



FIG. 168. DIAGRAM OF THE COURSE OF THE URINIFEROUS TUBULES. 



branched into a number of tubuli at the base of the pyra- 

 mid ; all the tubuli in the pyramid run in a straight direc- 

 tion, and are called the tubuli of Bellini. When it 

 reaches the base of the pyramid the tubule sends off a 



