Origin: Anterior surface of transverse processes, lateral border of vertebrae and intervertebral discs from T12 – L5.
Insertion: Lesser trochanter of the femur.
Action: Flexes the hip joint.Assists in flexing the femur with minimal external rotation. With the femur stabilised, assists in flexing the torso as in sitting up from a prone position.
Position: From a supine position flex the femur 30° with 10° abduction
Rotation: Externally rotate the femur.
Stabilise: Opposite side iliac crest.
Monitor: Apply pressure at the anterior medial leg above the ankle toward extension with slight abduction.
Nerve Supply: Lumbar plexus - L1, L2, L3, L4.
Parasympathetic: Vagus X
Anterior: Medial 1/2 of the 5th rib space on the left side for both muscles though occasionally right too.
Posterior: 2cm lateral to midline between T6 & T7 on the left.
Neuro-Vascular Reflex: Bilateral frontal eminences.
Yuan point: St42
Nutrition: Vit. B, betaine hydrochloride.