426 



INTERNAL ILIAC ARTERY. 



BRANCHES. (a) The inferior or external hcemorrhoidal arteries, two or three in 

 number, incline inwards from the pudic artery as it passes outside the ischio-rectal 

 fossa above the tuber ischii. These small vessels run across the ischio-rectal fossa, 

 through the fat in that space, and are distributed to the sphincter and levator ani 

 muscles, and to the parts surrounding the anus. 



Fig. 292. 



Fig. 292. VIEW OF THE DISTRIBUTION OP THE ARTERIES TO THE VISCERA OP THE MALE 



PELVIS, AS SEEN ON THE REMOVAL OF THE LEFT Os INNOMINATUM, &C. (from R. Qliain). 



a, left external oblique muscle of the abdomen divided ; b, internal oblique ; c, trans- 

 versalis; d, d, the parts of the rectus muscle divided and separated; c. psoas magnus 

 muscle divided ; f, placed on the left auricular surface of the sacrum, points by a line to 

 the sacral plexus of nerves ; g, placed on the os pubis, sawn through a little to the left of 

 the symphysis, points to the divided spermatic cord ; h, the cut root of the crus penis ; 

 *, the bulb of the urethra ; fc, elliptical sphincter ani muscle ; Z, a portion of the ischium 

 near the spinous process, to which is attached the short sacro-sciatic ligament ; m, the 

 parietal peritoneum; n, the upper part of the urinary bladder; n', n', the left vas deferens 

 descending towards the vesicula seminalis ; n", the left urettr ; o, the intestines ; ], the 

 common iliac at the place of its division into external and internal iliac arteries ; 2, left 

 external iliac artery ; 3, internal iliac ; 4, obliterated hypogastric artery, over which the 

 vas deferens is seen passing, with the superior vesical artery below it ; 5, middle vesical 

 artery ; 6, inferior vesical artery, giving branches to the bladder, and descending on the 

 prostate gland and to the back of the pubes ; 7, placed on the sacral plexus, points to the 

 common trunk of the pudic and sciatic arteries ; close above 7, the gluteal artery is seen 

 cut short ; 8, sciatic artery cut short as it is escaping from the pelvis; 9, placed on the 

 rectum, points to the pudic artery as it is about to pass behind the spine of the ischium ; 

 9', on the lower part of the rectum, points to the inferior hasmorrhoidal branches ; 9", 

 on the perinaeum, indicates the superficial perineal branches ; 9'", placed on the prostate 

 gland, marks the pudic artery as it gives off the arteries of the bulb and of the crus penis ; 

 10, placed on the middle part of the rectum, indicates the superior hsemorrhoidal arteries 

 as they descend upon that viscus. 



(&) The superficial perineal artery, a long, slender, but regular vessel, supplies the 

 scrotum and the upper part of the perinaeum. Given off from the pudic artery in 

 front of the haemorrhoidal branches, it turns upwards parallel with the pubic arch, 

 crosses the transverse muscle of the perinseum, and runs forwards under cover of the 



