PSOAS MAJOR MUSCLE : ANATOMY 

Describe the origin of psoas major muscle?
What are the actions of psoas major muscle?
How the psoas major arises from the slips and tendinous arches on lumbar spine?
Name the various branches of lumbar plexus emerge psoas major?
When the neck of femur is broken, the distal segment of the femur rotates laterally ?
What are the relations of the Psoas Major?
Actions of the psoas major are:
1. Flexes the trunk against gravity when the body is supine : With the iliacus, it acts as a powerful flexor of the hip joint as in raising the trunk from supine to sitting posture.
2. It flexes the thigh at the hip joint when the trunk is stabilized.
3. When the muscle of one side acts alone, it brings about lateral flexion of the trunk on that side.
4. Helps in maintaining stability at the hip and balances the trunk while sitting.
5. It is a weak medial rotator of the femur at hip when foot is on the ground.
6. It is a weak lateral rotator of the femur at hip when foot is off the ground.
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Source of images:
1. COMPLETE ANATOMY, www.3d4medical.com
2. Gray's Atlas Of Anatomy 2nd Edition.