PELVIS 60 1 



Arteria Ilio-lumbalis (Ilio-lumbar Artery). The ilio- 

 lumbar artery springs from the posterior division of the hypo- 

 gastric artery and passes upwards, laterally, and backwards, 

 behind the obturator nerve, the external iliac vessels, and the 

 psoas magnus muscle, into the iliac fossa, where it divides 

 into lumbar and iliac branches. The lumbar branch runs 

 upwards, and terminates in the substance of the quadratus lum- 

 borum and psoas magnus muscles, where it anastomoses with 

 the lower lumbar arteries. It gives off a small spinal branch, 

 which enters the spinal canal through the intervertebral 

 foramen between the fifth lumbar vertebra and the sacrum. 

 The iliac branch breaks up into branches, some of which run 

 laterally in the substance of the iliacus and others between 

 the muscle and the bone. One of the latter set enters the 

 nutrient foramen in the iliac fossa. The terminal branches 

 reach the crest of the ilium, where they anastomose with the 

 deep circumflex iliac and lumbar arteries. 



Arteria Glutsea Superior (O.T. Glutseal Artery). The 

 superior glutseal artery is the largest branch of the hypogastric 

 artery, and may be regarded as the continuation of the posterior 

 division. Its course in the pelvis is short. It passes back- 

 wards, between the lumbo-sacral cord and the first sacral 

 nerve, and leaves the cavity through the upper part of the 

 great sciatic foramen, above the piriformis muscle. 



Arteria Sacralis Lateralis (Lateral Sacral Artery). The 

 lateral sacral artery is occasionally a single vessel, but more 

 commonly it is represented by two branches, which run 

 medialwards in front of the sacral nerves to the lateral 

 borders of the anterior sacral foramina. The upper of the 

 two enters the first sacral foramen. The lower runs down- 

 wards, lateral to the foramina and the sympathetic cord, 

 and across the roots of the sacral nerves, to the tip of the 

 coccyx where it anastomoses with the middle sacral artery. 

 As it descends it sends spinal branches into the foramina. 

 These assist the upper artery to supply the membranes and 

 nerve-roots within the canal ; then they emerge through the 

 posterior sacral foramina and anastomose with branches of 

 the superior glutseal artery. 



Arteria Hsemorrhoidalis Superior (Superior Haemorrhoidal 

 Artery). The superior hsemorrhoidal artery is the direct 

 continuation of the inferior mesenteric artery. It enters the 

 root of the pelvic meso-colon and descends in it as far as the 



