PELVIS MINOR 



419 



of the middle third with the lower third of the external iliac 

 artery to the upper margin of the obturator foramen. Below 

 the superior ramus of the pubis it forms a distinct thickened 

 border which bridges across the upper part of the obturator 

 foramen, and forms the lower boundary of the commence- 

 ment of the obturator canal, by which the obturator artery 

 and nerve leave the pelvis. To the medial side of the 

 obturator foramen the parietal fascia blends with the 



Urinary bladder 



Levator ani 



Pubic arch 

 Deep transverse 

 perineal muscle 

 Inferior fascia of uro- 

 genital diaphragm \^ 

 Crus penis " 

 Ischio-cavernosus 



Scrotal vessels and 

 nerves 



Fascia of Colics - 



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 



FIG. 194. Vertical transverse 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. 



periosteum on the back of the body of the pubis, along a 

 line which descends towards the apex of the pubic arch and 

 passes below the line of attachment of the visceral layer. The 

 parietal layer is deficient, therefore, in the region of the upper 

 part of the anterior wall of the pelvis, and as its anterior 

 margin blends with the periosteum on the pubis any effusion 

 lying external to the fascia will be prevented from extending 

 forwards to the anterior part of the pelvis. 



The lower part of the parietal layer should next be 



n27 a 



