540 



THE VEINS OF THE PELVIS. 



pudic veins do not receive the main supply of blood from the dorsal vein of the 

 penis, and that the ilio-lumbar veins open into the common iliac trunks. The vis- 

 ceral veins are remarkable for their size and frequent anastomoses, and form a series 

 of plexuses, named prostatic, vesical, hwmorrhoidal, vaginal, and uterine. 



The gluteal, sciatic and oUurator veins agree closely with the arteries of the same 

 name. 



The lateral sacral veins form, by their communications with one another and 

 with the middle sacral veins, a plexus over the anterior surface of the sacrum. They 

 receive branches from the sacral canal through the anterior sacral foramina, and open 

 at two or three points into the internal iliac vein. 



The internal pudic veins, for the most part two in number, accompany the artery, 

 around which they form frequent communications, and unite into a single trunk 



Fig. 415. INTERNAL VIEW OP THE 



MALE PELVIS FROM THE LEFT 

 SIDE, TO SHOW THE PRINCIPAL 



VEINS. (Allen Thomson. ) | 



The greater part of the pelvic wall 

 of the left side, and the upper parts 

 of the rectum and urinary bladder 

 have been removed ; the left common 

 iliac and the right internal iliac 

 arteries, and the left external and 

 internal iliac veins have been cut 

 short : a, right psoas magnus muscle ; 

 &, anterior superior iliac spine ; c, 

 Poupart's ligament ; d, cavernous and 

 spongy bodies of the penis divided 

 near the root ; + , bulb of spongy 

 body, above which is the membranous 

 part of the urethra ; e, left os pubis, 

 sawn through close to the symphysis ; 

 /, anus ; g, spine of ischium with 

 small sacro-sciatic ligament; h, auri- 

 cular surface of sacrum ; i, bladder ; 

 1:, rectum ; I, transverse process of 

 fourth lumbar vertebra ; 1, inferior 

 vena cava ; 1', abdominal aorta ; 2, 2, 

 common iliac veins ; 2', right common 

 iliac artery ; 3, 3, external iliac veins ; 

 3', external iliac artery ; 4, 4, internal 

 iliac veins ; 5, 5, middle sacral vein ; 



6, 6, ilio-lumbar and lumbar veins ; 



7, right gluteal and upper lateral 

 sacral veins ; 8, 8', obturator vein 

 and artery of right side ; 9, veins 

 ascending from vesical plexus on right 

 side ; 9', lower part of vesical plexus 

 on left side ; 10, on the small sacro- 

 sciatic ligament, indicates on the right side the junction of the pudic and sciatic veins, on the left 

 side the trunk of the pudic vein ; 10', perineal veins ; 11, on the prostate, the left division of the 

 dorsal vein of the penis joining the prostatic plexus, which is continued into the lower part of the 

 vesical plexus ; 12, on the lower part of the rectum, may indicate the position of the hremorrhoidal 

 plexus. 



before entering the pelvis. They receive the veins of the corpus cavernosum and of 

 the bulb, the transverse and superficial perineal, and the inferior haemorrhoidal 

 veins. 



The dorsal vein of the penis commences by branches which issue from the glans 

 penis and prepuce and form in the first instance two veins, one on each side of the 

 middle line. These speedily unite and give rise to a single vessel which runs back- 

 wards between the two dorsal arteries, in the median groove on the upper surface of 

 the penis, receiving on its way branches from the corpus spongiosum, and others 



