THE PERINEUM. 



451 



to the ascending rami of the ischia and pubes and invests 

 the deeper perinea! structures. It passes backward to 

 the posterior border of the trans versus perinei, around 

 which it is reflected. It then becomes very much thick- 

 ened and fibrous, and passes forward, being firmly at- 



FIG. 197. MUSCLES OF THE PERINEUM, WITH SUPERFICIAL VESSELS 

 AND NERVES. 



1, triangular ligament : 2, tendinous centre of the perineum ; 3, transversus perinei ; 

 4, ischio-rectal fossa ; 5, inferior pudenda! nerve ; 6, transversalis perinei artery ; 7, super- 

 ficialis perinei artery ; 8, external haemorrhoid artery and nerve. 



tached to the ascending rami of the ischia, descending 

 rami of the pubes, and the subpubic ligament. It is 

 pierced by the urethra and the dorsal vein of the penis, 

 and is commonly called the triangular ligament. It is also 

 known as the superficial layer of the deep perinea! fascia. 



