34 



PRACTICAL HISTOLOGY. 



[XXVIII. 



tubule consists of a basement membrane lined by a single layer of 

 epithelium. The tubules alter their character and course in dif- 

 ferent parts of the organ. The tubules begin in the cortex in a 



Sub-cap- 



sular layer. 



12. Junc- 

 tional tu- 

 bule. 



ii. Convolu- 

 ted tubule. 

 10. Irregu- 

 lar tubule. 



A. CORTEX. 



3. Proximal 

 convoluted 

 tubule. 



p. Ascend- 

 ing tubule. 

 2. Neck. 



4. Spiral 

 ".ubule. 



* ^ i. Capsule 



and glome- 

 rulus. 



7 and 8. Ascending 

 part of Henle's loop. 



5. Descending limb 

 of Heule's tubule. 



6. Henle's loop. 



15. Discharging 

 tubule. 



C. PAPILLAKY ZONK. 

 FIG. 294. Diagram of the Course of Two T'rmiferous Tubules. 



globular dilatation the Malpighian capsule which encloses a 

 tuft of vessels the glomerulus (fig. 294). The capsule leads into 

 a narrow neck, which passes into the first or proximal convoluted 



