Fig- 157' Male Perineum. IV. Urogenital Triangle. Ampulla of 



Rectum. 



The deep layer of the triangular ligament is exposed on the left side by remov- 

 ing the superficial layer of the triangular ligament and the Corpus Spongiosum 

 as far as the middle line; the Urethra, Cowper's Gland, the left Corpus Caver- 

 nosum and the Dorsal Artery of the Penis have, however, been preserved. 



In front of the Transverse Perineal Muscle, the Compressor Urethrae 

 Muscle (the Muscle of the Urogenital Triangle of Waldeyer) is shewn. This 

 muscle arising from the bony margin of the Pelvis (Ischium and Pubis) and the 

 fibrous portion of the Ischio-Cavernosus Muscle, passes to join its fellow of the 

 opposite side in the middle line. The outlines of the Bulb are delineated in blue; 

 Cowper's Glands and Duct which are not exposed by the dissection (cf. Fig. 156) 

 are also indicated. 



Anteriorly the Compressor Urethrae Muscle is connected with the Trans- 

 verse Pelvic Ligament which may be looked upon as an aponeurotic covering of 

 the muscle or as a blending together of the superficial and deep layers of the 

 triangular ligament. Waldeyer has named this the Preurethral Ligament; 

 ■emerging through the fibres near the anterior border of the Compressor Urethrae 

 Muscle, the Dorsal Artery of the Penis is seen ; this vessel a branch of the Internal 

 Pudic soon gives off the artery to the Corpus Cavernosum. The chief object of 

 this figure is to give an idea of the position and size of the Ampulla of the 

 Rectum when distended (red). In this part of the Rectum which lies above the 

 Anus and which is capable of considerable distension faeces may, and frequently 

 do, accumulate if the bowel is not emptied. On the right side an abnormal Muscle 

 the Ischio-Bulbosus is shewn between the Ischio- and Bulbo-Cavernosus Muscles. 



