MALE PERINEUM 



363 



The dorsal nerve of the penis follows the pudendal artery 

 between the two fasciae of the urogenital diaphragm, where it 

 lies more completely under shelter of the side of the pubic arch 

 than the artery. Finally, piercing the superficial layer of 

 the diaphragm, about half an inch below the symphysis 

 pubis, it accompanies the dorsal artery of the penis. At the 

 root of the penis it supplies one or two twigs to the corpus 

 cavernosum penis. 



Hulbo-cavernosus musck 



Internal pudcndai artery 



Urogenital diaphragm 



(inferior fascia) 

 Urogenital diaphragm 

 (superior fascia) 



Prostate _ 



Levator an 



Seminal vesicle 



Ductus deferens 



BCto-vesical fascia 



Rectal fascia 



Rectum 



Levator ani 



Glutaeus maximus 



Ischio-cavernosus mu: 



Sphincter ani 

 externus 



FIG. 136. Dissection to expose the Prostate from the Perineum. 



The dissection of the perineum, to the extent usually possible in three 

 days, is now completed, and the student should notice that in the urethral 

 triangle he has opened two fascia-bounded compartments. The superficial 

 compartment lies between Colics' fascia and the urogenital diaphragm. 

 Posteriorly this is closed by the union of the fascia and the diaphragm. 

 Laterally it is closed by the attachment of the fascia and the diaphragm to 

 the rami of the ischium and pubis. Anteriorly, since the fascia of Colles 

 is continuous with the deep layer of the superficial fascia of the abdominal 

 wall, the pouch is open, and fluid poured out into it can pass upwards to 

 the abdominal wall. For the contents of the pouch see p. 343. The deep 

 pouch lies between the two fascia; of the urogenital diaphragm. It is 

 closed posteriorly and anteriorly by the union of the two layers, and 

 laterally by the attachment of the two layers of the diaphragm to the rami 

 of the pubis and ischium. For the contents of the deep compartment 



