THE URINARY BLADDER. 141 



OBSERVE: 

 (L.) 



1. The relative thickness of the epithelium. 



2. The narrow mucosa. 



3. The internal circular muscular belting. 



4. The transversely divided bundles of the external longitudi- 

 nal muscular layer. 



5. The large arteries between the muscular bundles. 



6. Adipose tissue, more or less abundant in the loose cellular tis- 

 sue surrounding these canals. (This element will afford a prominent 

 feature of a section of the pelvis of the kidney, while the muscular 

 tissue will be seen to a limited extent only.) 



(H.) 



7. The epithelium, (a) That it is of the stratified type, though 

 poorly demonstrated, (b) The broad basal attachment of the 

 deep cells, (c) The elongate form of the cells generally, (d) 

 That the borders are smooth and closely adherent, unlike those 

 of the vagina, (e) The more flattened surface cells. (/) The 

 outline of the last, as seen in the detached specimens, (g) The very 

 large and finely granular nuclei. (These cells contain peculiarly 

 large nuclei, as compared with the size of the body The deeper 

 examples present tapering prolongations, generally at one end only, 

 and are hence called " tailed cells/' They will not be confounded 

 with similarly shaped, though much larger cells from the bladder. 

 The surface elements, while sometimes nearly circular, generally pre- 

 sent one or two incurvations of the periphery, indicating their con- 

 nection with the neighboring cells. These peculiarities are best 

 exhibited in Fig. 97.) 



8. (Keview the objects previously examined with low power.) 



THE URINARY BLADDER. 



VERTICAL SECTION OF IKNER PORTION OF WALL. (Fig. 96.) 



OBSERVE: 

 (L.) 



1. The epithelial lining, (a) That it is formed after the strati- 

 fied type, (b) That, as compared with other previously studied por- 

 tions of the genito-urinary tract, the epithelium is thin. 



