BRANCHES OF THE INTERNAL ILIAC VEIN. 



499 



diateiy underneath the mucous membrane. From it proceed superior, 

 middle, and inferior heemorrhoidal veins accompanying the arteries of 

 the same name, and it communicates freely with the plexuses in front of 

 it. The superior hscmorrhoidal vein being a branch belonging to the 

 portal system, the hsemorrhoidal plexus forms a very direct communi- 

 cation between the portal and general venous systems. 



Fig. 318.— Internal Fig. 318 



View of the Male 

 Pelvis fkom the 

 left side, to show 

 the Principal 

 Veins. (A. T.) i 



The greater part of 

 the OS innommatiim 

 and pelvic wall of the 

 left side, and the 

 upper parts of the 

 rectum and urinary 

 Ijladder, have been 

 lemoved : the lefl 

 common iliac and the 

 light internal iliac 

 arteries, and the left 

 external and internal 

 iliac veins, have been 

 cut short. «, the right 

 jjsoas magnus muscle ; 

 6, the anterior su- 

 perior iliac spine ; c, 

 Poupart's ligament ; 

 d, the cavernous and 

 spongy body of the 

 penis divided near the 

 root ; + , the spongy 

 body of the bulb, 

 abovewhich the mem- 

 branous part of the 

 urethra, the prostate, 

 &c. ; €, the left os 

 imbis close to the 

 symphysis ; /, the 

 anus ; g, the spine of 

 the ischium with the 



short sacro-sciatic ligament ; 7i, auricular sacro-iliac surface 

 bladder ; k, exterior of the rectum ; I, transverse j)rocess of the fourth lumbar vertebra ; 

 1, lower part of the vena cava inferior; 1', abdominal aorta ; 2, common iliac veins; 

 2', right common iliac artery ; 3, external iliac veins ; 3', external iliac artery ; 4, internal 

 iliac veins, that of the I'ight side entire, that of the left divided and in great part 

 removed ; 5, middle and other veins of the sacral plexus ; 6, ilio-lumbar and lumbar 

 veins ; 7, right gluteal and upper lateral sacral veins ; 8, 8', obturator vein and artery 

 of the right side ; 9, pelvic plexus of veins of the right side ; 9', that of the left side 

 connected with the lower vesical plexus ; 10, placed on the right side on the short sacro- 

 sciatic ligament immediately below the division of the internal iliac vein into the pudic 

 and sciatic veins : on the left side, below 4, the sciatic vein is cut short ; 10, lower 

 down, the pudic vein ; 10', the perineal veins ; 11, placed on the prostate among the 

 lower vesical veins, into one of which the left dorsal vein of the penis, 11, is seen to 

 pass ; I'J, placed on the lower part of the rectum, may indicate the plexus of hremorr- 

 hoidal veins. 



The vaginal plexus, surrounding the vagina principally in its 

 lower part, communicates freely with the hoemorrhoidal and vesical 

 plexuses. 



K s 2 



interior of the urinary 



