SURGICAL ANATOMY. 



Fascice of the Perineum. 



385 



The pelvic fascia at the brim of the pelvis is continuous 

 with transverse and iliac fascia; covers sacrum and pyriformis 

 muscle, external iliac artery, and sacral nerves. It forms the 

 anterior and lateral ligament of bladder (true). It forms arcus 

 tending or white line, corresponding to division of pelvic fascia 

 into two layers, the obturator and recto-vesical, extending from 

 pubis to spine of ischiurn, from which originates the levator ani 

 muscle, with recto-vesical and ischio-rectal or anal fasciae above 

 and below the muscle respectively. 



*wy rf Corf*, f- 



FIG. no. 

 Male perineum, deep dissection. (Lydston.) 



The obturator fascia, the continuation of the pelvic fascia, 

 incloses the pudic vessels and nerve in a sheath, covers the in- 

 ternal obturator muscle, and forms the posterior layer of the 

 triangular ligament. 



Recto-vesical or visceral layer of the pelvic fascia, the con- 

 tinuation of the pelvic fascia, descends into the pelvis investing 

 the prostate gland and the vesico-prostatic plexus of veins, the 

 bladder (forming the anterior and lateral true ligaments) and 

 the rectum. It is perforated in the female by the vagina. 



