MALE PERINEUM 



357 



ficial transversus perinei muscles with the fascia of Colles. 

 In addition to this attachment, however, a careful dissection 

 in a good subject will show that the central part of the 

 base projects backwards in the form of a short process or 

 beak, which joins the central point of the perineum. Near 

 the symphysis pubis the anterior margin, fused with the 

 anterior margin of the deep fascia of the diaphragm, forms 

 the transverse ligament of the pelvis. Between the anterior 



Dorsal vein of penis 



Dorsal artery and nerve of 

 the penis 



Artery to corpus cavernosum 

 penis 



Transverse ligament of 

 the pelvis 



Internal pudendal 

 artery 



Urethra 



Bulbo-urethral 

 gland 



Deep transversus 

 perinei muscle 

 Artery to bulb 

 of urethra 



Inferior layer of urogenital 

 diaphragm 



FIG. 134. Deep dissection of the Perineum. The penis has been removed, 

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

 removed on the left side. 



border of this band and the arcuate ligament of the pubis an 

 oval gap is left for the passage of the dorsal vein of the penis. 



In the erect posture of the body the superficial surface of 

 the urogenital diaphragm looks downwards and forwards, 

 whilst its deep surface looks upwards and backwards towards 

 the cavity of the pelvis. In close contact with its superficial 

 surface are the parts which constitute the root of the penis, 

 viz., the bulb and the two crura and the muscles which are 

 associated with them, also the superficial transversus perinei 

 muscle on each side. The structures which lie between 



I 23 a 



