THE INTEENAL PUDIC ARTER"i. 



445 



lies externalh- to the ischio-rectal fossa and internally to the obturator 

 infeernus musde, and beneath the triangular ligament it is crossed by 

 the deep transverse perineal muscle. 



Branches. — («) The infcripv or external hcemorrlioidal arteries, two or three 

 in number, incline inwards from the pudic arteiy 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 suiTounding the anus. 



(J>) The sttjicrjivial j'crinml artery, a long, slender, but regular vessel, supplies 



Fig. 285. — View of the Distribution of the Arteries to the Viscera of the Male 

 Pelvis, as seen on the removal of the Left Os Innojiinatum, &c. (from R. Quain). \ 



a, left external oblique muscle of the abdomen divided ; 5, internal oblique ; c, trans- 

 versalis ; d, d, the parts of the divided rectus muscle ; e, psoas magnus muscle divided ; 

 /, jjlaced 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 diA'ided spermatic cord ; h, the cut root of the crus penis ; i, the 

 bulb of the urethra ; k, external sphincter ani muscle ; /, spine of the ischium, 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 ureter ; o, the intestines; 1, the common iliac at the place 

 of its division into external and internal ili.ac arteries ; 2, left external iliac artery ; 3, 

 internal iliac ; 4, obliterated hyjoogastric 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 pubis ; 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 iscLium ; 9', on the 

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

 perioaeum, 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 ; lo, 

 placed on tlie middle part of the rectum, indicates the superior hseraorrhoidal arteries as 

 they descend upon that viscus. 



