780 



THE UEINAEY TEACT. 



mation of large folds of the mucosa, which occlude the caliber of 

 all the above-named hollow formations when at rest. The cover- 

 ing epithelium is stratified, and composed of a limited amount of 

 the columnar, cuboidal, and flat varieties, the latter having often 

 a caudate appearance i. e., supplied with a number of offshoots 

 penetrating between the epithelia of the next deeper layer. Race- 

 mose, mucous glands are said to occur in the mucosa of the pel- 

 vis, but are absent from the mucosa of the ureter. (See Fig. 

 356.) 



CT 



FIG. 356. CALYX OF THE KIDNEY OF A DOG. 



__ K, stratified epithelia ; CT, connective tissue. Magnified 600 diameters. 



The muscle produces at least two layers an inner longitu- 

 dinal, which is most developed, and an outer circular layer. The 

 circular muscle-fibers are the only ones remaining at the points 

 of attachment of the calyx to the circumference of the papilla of 



