172 



ABDOMEN 



The inferior fascia of the urogenital diaphragm is not 

 an unbroken, continuous layer. It is pierced (i) by the 

 urethra; (2) by the internal pudendal arteries or their 

 terminal branches; (3) by the dorsal nerves of the penis; 

 (4) by the arteries to the bulb ; (5) and lastly, at its base, 

 where it blends with the superficial fascia, by the deep 

 branch of the perineal nerve. The aperture for the urethra is 

 situated in the middle line, 25 mm. (one inch) below the 



Deep dorsal vein of penis 



Dorsal artery and nerve of 

 Xthe penis _ 



Profunda penis artery 



Transverse ligament of 

 the pelvis 



Internal pudendal 

 artery 



Urethra 



Bulbo-urethral 

 _ gland 



M. sphincter 

 urethrae 

 membranacea? 

 Artery to bulb 

 of urethra 



Inferior fascia of urogenital 

 diaphragm 



FIG. 83. Deep dissection of the Perineum. The penis has been removed, 

 the urethra cut across, and the inferior fascia of the urogenital diaphragm 

 removed on the left side. 



symphysis pubis. It is not a clean-cut hole with sharp 

 edges. The margins of the opening, which are separated by 

 a considerable interval from the circumference of the urethra, 

 are prolonged over the bulb of the urethra so as to form 

 for it a fibrous capsule. As soon as the urethra gains the 

 superficial aspect of the fascia it sinks into the bulb, and 

 is carried forwards, through the entire length of the corpus 

 cavernosum urethrae, to its external opening on the glans 

 penis. On each side of the urethral aperture there is a 

 small opening in the fascia which gives passage to the 



