(Iliopsoas) Psoas Major

Hip-muscle-model-4-labeledMuscle Origin

Lumbar vertebrae to lesser trochanter of the femur.

Transverse processes of T12-L5 and the lateral aspects of the discs between them. The psoas major is divided into a superficial and deep part. The deep part originates from the transverse processes of lumbar vertebrae I-V. The superficial part originates from the lateral surfaces of the last thoracic vertebra, lumbar vertebrae I-IV, and from neighboring intervertebral discs. Wiki

Insertion

In the lesser trochanter of the femur.

Action

Flexion in the hip.

At the coxal joint, it flexes, laterally rotates, and adducts the hip.

Innervation – Nerve control

Lumbar plexus via anterior branches of L1-L3 nerves.

Artery

Lumbar branch of iliolumbar artery.

The lumbar branch of the iliolumbar artery (ramus lumbalis) supplies the psoas major and quadratus lumborum, anastomoses with the last lumbar artery, and sends a small spinal branch through the intervertebral foramen between the last lumbar vertebra and the sacrum, into the vertebral canal to supply the cauda equina. Wiki

Antagonist muscles

Gluteus maximus.

The gluteus maximus is the main extensor muscle of the hip. It is the largest and most superficial of the three gluteal muscles and makes up a large portion of the shape and appearance of each side of the hips. Wiki

Pictures of muscles

 

Trigger Point Referrals

 

Stretching description

 

Exercises

 

Injuries

 

Treatment

 

Additional Resources
Wiki
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