572 



ABDOMEN 



bladder is distended the folds are effaced, and the mucous 

 lining becomes smooth throughout. 



Orifices and Trigone of the Bladder. There are three 

 orifices in the bladder wall two orifices of inlet, the orifices 

 of the ureters; and one orifice of outlet, the orifice of the 



Urachus 



Peritoneum 



Trigone 

 Uvula 



Urethral crest 1 

 Utriculus prostaticus -- 



Membranous urethra 



Dilatation of urethra 



in the bulb - 

 Ducts of bulbo-,,..j; 

 urethral glands jp 



Wall of bladder 



Ureter 



Recto-vesical fascia 

 Pudendal plexus 

 Levator ani 

 Prostate 



Uro-genital 

 diaphragm 

 (superior layer) 

 Uro-genital 

 diaphragm 

 (interior layer) 



FIG. 224. Dissection of Bladder and Urethra from the front. 



urethra. They are situated at the three angles of the tri- 

 angular smooth area of the mucous membrane which is 

 known as the Trigonum Vesicce (Trigone of the Bladder], In 

 this area the mucous membrane is always smooth, whether 

 the bladder is distended or empty, on account of the close 

 connection which exists between the mucous and muscular 

 coats. At the anterior angle of the area is the internal 



