376 THE ABDOMEN AND PELVIS 



The Urogenital Triangle extends from the pubic 

 symphysis to the central point of the perineum, which lies 

 half an inch anterior to the anus, and it is limited laterally by 

 the pubic arch. 



The superficial fascia over this region consists of two strata. 

 The first is a fatty layer, continuous with the general fatty 

 covering of the body. The second, the deeper layer, is denser 

 and more membranous in character. Above, it is continuous 

 with the fascia of Scarpa (p. 240), which is continued downwards 

 from the abdomen on each side to be attached to the fascia lata 

 of the thigh just distal to the inguinal (Poupart's) ligament. 

 Between the two pubic tubercles, the fascia of Scarpa is carried 

 down over the urogenital triangle, where it is termed the fascia 

 of Colles. The latter encloses the penis, as in the finger of a 

 glove, clothes the scrotum, and finally blends with the base of 

 the urogenital diaphragm. Laterally, the fascia of Colles is 

 attached to the fascia lata of the thigh from the pubic tubercle 

 downwards and medially to the border of the pubic arch, and 

 then along the latter to the tuber ischii. 



The Superficial Perineal Pouch is a space which is bounded 

 in front by the fascia of Colles, and behind by the urogenital 

 diaphragm. It is closed inferiorly by the union of its two walls 

 and laterally by their attachments to the pubic arch . Superiorly, 

 however, it communicates freely with the cellular interval 

 between the fascia of Scarpa and the anterior wall of the rectus 

 sheath. The superficial perineal pouch contains the structures 

 which form the root of the penis and the muscles which cover 

 them (p. 377). It also contains the whole of the cavernous 

 (spongy) portion of the urethra, and rupture of this portion of 

 the urethra, whether from trauma or following stricture, leads 

 to extravasation of urine into the pouch. This first affects the 

 lowest part of the pouch, viz. between the neck of the scrotum 

 and the base of the urogenital diaphragm, and then passes 

 forwards and distends the scrotum (Fig. 115). The loose cellular 

 tissue of the penis next becomes infiltrated, and the " ram's 

 horn penis " is produced. Lastly, the extra vasated urine 

 passes upwards on to the anterior abdominal wall spreading 

 laterally behind the fascia of Scarpa, and the attachment of the 

 latter to the fascia lata prevents its downward spread into the 

 thigh. 



The root of the penis consists of the bulb and the two crura. The 

 bulb is placed in the median plane and is closely attached to the inferior fascia 



