PELVIS MINOR 



429 



(Cowper's), are emitted from the body. It commences 

 at the internal urethral orifice of the urinary bladder and 

 ends on the glans penis. Its average length is 200 mm. 

 (eight inches). It is customary to divide the canal into three 

 parts, from the different characters of the structures which it 



Symphysis pubis 



Position of prostat 

 Urethral opening 



Trigone 



Opening of urete 

 Ureter piercing 

 wall of bladder 

 Seminal vesicle 

 Ductus \ 

 deferens 



lary bladder 



Obturator canal 

 X 



Obturator vessels 

 and nerve 

 Ureter 



nferior vesical and 

 middle haemor- 

 rhoidal arteries 



Pelvic plexus 



Obturator 



interims 



Parietal 



pelvic fascia 



Pirifonnis 



Inferior glute 



and internal 



pudenda! arteries 



Pelvic plexus 



Sacral pie; 



Sacro-iliac joint 



Branches of superior 

 haemorrhoidal artery 



Terminal portion 

 of pelvic colon 



Parietal pelvic 

 fascia 



Superior gluteal 

 artery piercing 

 parietal pelvic fascia 

 Inferior gluteal and in- 

 ternal pudendal arteries 

 Lumbo-sacral trunk and 

 ist sacral nerve 

 Sacro-iliac joint 



Branches of superior 

 haemorrhoidal artery 



FIG. 20 1. Oblique section from above downwards and forwards through the 

 Pelvis. The peritoneum has been removed so as to expose the viscera 

 and the parietal pelvic fascia clothing the pelvic wall. 



traverses. The first part, pars prostatica urethra, is contained 

 within the substance of the prostate gland ; the second part, 

 pars membranacea urethra, extends from the prostate to the 

 bulb of the corpus cavernosum urethrae, and is surrounded, 

 between the fasciae of the urogenital diaphragm, by the fibres 

 of the sphincter muscle of the membranous urethra ; the third 



