THE INTERNAL ILIAC ARTERY Oli 



through the upper part of the sacro-sciatic Hgament and runs backward and down- 

 ward ''on the latter under cover of the biceps fcmoris (Fig. 455). It gives 

 branches to that muscle and to the semitendinosus and semimembranosus, and 

 anastomoses with the ohtm-ator, deep femoral, and posterior femoral arteries. 



(4) The lateral coccygeal artery (A. caudalis lateralis vcntralis) continues the 

 direction of the lateral sacral, but is much smaller than the preceding vessel. It 

 passes back between the depressor and intertransversales muscles of the tail and 

 divides into two branches which mp\)\y twigs to the muscles and skin. 



4. The ilio-lumbar artery (A. iliolumbalis) arises at a right angle from the 

 internal iliac and nms outward behind the sacro-iliac joint, crossing the ventral 

 surface of the ilium under cover of the iliacus muscle. It gives branches to the ilio- 

 psoas and longissimus, and terminates by turning around the external border of the 



Common 

 iliac veins 



Internal iliac ark-ry 

 External iliac artery 

 Circumflex iliac artery 

 External angle of ilium 



Inguinal ligament 



Sartorius 



Femoral nerve 



Internal circumfJi 



vessels 



Trochanter terlius 



Fetnoral vessels 



Obtuiator ve-^sds 



Bicips femoris 

 Semitendinosus 

 Seniimemhranosus 



Fig. 456.^ — Deep Dissection of Ventral Wall of Pelvis of Hohse (Male). 

 1, External pudic artery and small satellite vein; 2, anastomosis between external pudic and internal cir- 

 cumflex veins; S, accessory ligament; 4, round ligament; 5, transverse ligament; ff, head of femur; 7, obturator 

 externus (stumps); S, inner margin of obturator foramen; 9, origin of gracilis; iO, origin of adductor; ^/, bulbo- 

 cavernosus; 12, retractor penis; 13, suspensory ligament of penis. (After Schmaltz, Atlas d. Anat. d. Pferdes.) 



ilium a little behind the external angle, giving branches to the gluteus medius 

 and tensor fasciae latie (Fig. 455). 



5. The anterior gluteal artery (A. glutea cranialis) is the largest branch of the 

 internal iliac. It arises usually opposite to the preceding vessel and passes outward 

 through the great sacro-sciatic foramen, dividing into several branches as it 

 emerges; these enter the gluteal muscles (Fig. 455). 



6. The iliaco-femoral or external circumflex artery (A. circumfiexa femoris 

 lateralis) passes downward and outward across and beneath the shaft of the ilium, 

 under cover of the iliacus muscle, and dips in between the rectus femoris and 

 vastus externus. It is accompanied by two satellite veins. It gives collateral 

 branches to the iliopsoas, the glutei, and the tensor fascise latae, supplies the 

 nutrient artery of the ilium, and terminates in the quadriceps femoris (Fig. 455). 



7. The oiaturator artery (A. obturatoria), the inner terminal branch of the 

 internal iliac, passes downward and l)ackward on the pelvic surface of the shaft of 



37 



