innervated by innervated_by has muscle origin has muscle origin has muscle insertion has muscle insertion Homo sapiens transverse process of vertebra psoas major muscle http://upload.wikimedia.org/wikipedia/commons/e/e2/Anterior_Hip_Muscles_2.PNG The psoas major is a long fusiform muscle placed on the side of the lumbar region of the vertebral column and brim of the lesser pelvis. It joins the iliacus muscle to form the iliopsoas. In less than 50 per cent of subjects the psoas major is accompanied by the psoas minor. [WP,unvetted]. m. psoas major UMLS:C0224419 MA:0002358 Wikipedia:Psoas_major_muscle NCIT:C33420 BTO:0001877 SCTID:244952006 EMAPA:18169 FMA:18060 UBERON:0001298 psoas major lesser trochanter psoas muscle lumbar nerve