422 



ABDOMEN 



should repeatedly convince himself, by introducing the index 

 finger of his right hand into the rectum and that of his left 

 hand into the pelvis, that he can quite easily define the 

 outlines of the prostate and the seminal vesicles by a process 

 of palpation ; and when he has completed the dissection he 

 should note that he has demonstrated that the visceral layer of 

 the pelvic fascia, which is single laterally, is cleft medially 



Crus penis 



Internal pudendal artery 



Bulb 

 Urogenital diaphragm . - 



(inferior fascia) 

 Urogenital diaphragm 

 (superior fascia) 

 Prostate 

 M. levator an 

 Seminal vesicle 

 Ductus deferens 

 :cto-vesical fascia 

 Rectal fascia 

 Rectum 

 M. levator ani 



M. glutaeus 

 maximus 



M. bulbocavernosus 



M. ischiocavernosus 



Urethra 



Inf. fascia of urog. dia 

 Sup. trans, muscle 

 CoUes' fascia 



M. sphincter ani 

 externus 



FIG. 196. Dissection to expose the Prostate from the Perineum. 



into three lamellae by the interposition of the rectum between 

 a middle and a lower layer, and the interposition of the 

 bladder and the prostate between the middle and an upper 

 layer. There are two compartments, therefore, in the sub- 

 stance of the fascia : a lower or posterior, which contains the 

 rectum; and an upper or anterior, in which lie the bladder, the 

 prostate, the seminal vesicles, and the lower parts of the ductus 

 deferentes. 



Dissection. The suspensory ligament of the penis, which has 

 already been defined (see p. 245), must now be detached from 

 the front of the symphysis. The left crus of the penis has already 

 been separated, and the right crus should now be cut away from 



