THE URINARY ORGANS. 



173 



5. The urethra differs in structure in the two sexes. In the 

 male the prostatic portion is lined with epithelium resembling that 



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Fig. 151. 



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Epithelial cells from the mucous membrane of the human bladder. (Rieder.) 



Fig. 150. — From the urinary sediment from a case of cystitis. The cells are somewhat 



swollen after maceration in the altered urine. 

 Fig. 151. — Removed from the internal surface of a normal bladder. 



of the bladder. Further forward, it gradually passes into cylin- 

 drical epithelium, at first more than one layer thick ; but in the 



