Origin: superior 2/3 of the iliac fossa, internal border iliac crest, anterior sacroiliac, lumbosacral and iliolumbar ligaments, ala sacrum;
Insertion: Lesser trochanter of femur and for a short distance below along medial border of the shaft;
Action: Flexes thigh at the hip, minimal activity on lateral rotation of the thigh;
Reversed origin-insertion action: when the thigh is fixed, the iliacus muscle flexes the pelvis on the thigh,
as in rising to a sitting position from the supine position;
Nerve Supply:
Femoral,
L1,
L2,
L3; (see
innervation )
Synergists:
psoas major,
adductor longus,
adductor brevis, adductor magnus,
rectus femoris;
