Psoas from anterior surfaces and lower borders of transverse processes of L1 - L5 and bodies and discs of T12 - L5; Iliacus from upper 2/3 of iliac fossa of ilium, internal lip of iliac crest, lateral aspect of sacrum, ventral sacroiliac ligament, and lower portion of iliolumbar ligament
Insertion
Lesser trochanter
Action
Flex the torso and thigh with respect to each other
Innervation
Psoas from direct fibers of L1 - L3 of lumbar plexus; Iliacus from muscular branch of femoral nerve
Arterial Supply
Lumbar branch of iliopsoas branch of internal iliac artery
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