PELVIS 



565 



The lower part of the parietal layer should next be 

 examined. In the dissection of the perineum the student 

 saw that the lower part of the parietal pelvic fascia formed 

 the lateral wall of the ischio-rectal fossa, and that it blended, 

 immediately below the origin of the levator ani, with the 

 lower layer of the fascia of the pelvic diaphragm which covers 

 the lower surfaces of the levator ani and the coccygeus (anal 

 fascia). He saw also that, in the anterior part of the peri- 



Bladder 



Levator ani 



Deep transverse 

 perineal muscle 

 Inferior fascia of uro- 

 genital diaphragm 



Crus penis" " 

 Ischio-cavernosus 



Scrotal vessels and 

 nerves 



Upper fascia of 

 ,' pelvic diaphragm 

 -Endo-pelvic fascia 



Sheath of 

 . prostate 



Lower fascia of 

 - pelvic diaphragm 

 .Parietal pelvic 



fascia 

 '...Obturator 



membrane 



-- Superior fascia of uro- 



genital diaphragm 

 Pudendal vessels and 



nerve 



Crus penis covered by 

 ischio-cavernosus 



Bulbo-cavernosus covering 

 the bulb of the urethra 



Fascia of Colles - 



FIG. 2 1 8. Vertical section through the Bladder, Prostate, and Pubic Arch 

 to show the arrangement of the Endo-pelvic Fascia : schematic. The 

 endo-pelvic fascia is depicted in red. 



neum, the parietal fascia extended medially, as the superior 

 fascia of the uro- genital diaphragm, from the margin of the 

 pubic arch to the side of the urethra, where it not only 

 blended with the fascia coming from the opposite side, but 

 also became continuous, round the anterior border of the 

 levator ani, with the fascia on the upper surface of that 

 muscle, that is, with the visceral layer of the pelvic fascia. 

 To display the details of the visceral layer of the fascia the 

 final stages of the dissection of the perineum must now be 

 completed. 



