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PSOAS MAJOR

ORIGIN

Anterior surfaces of the transverse processes of T12-L5 vertebrae, the upper two thirds of the iliacus

 

INSERTION

The lesser trochanter of the femur after being joined by the iliacus

 

ACTION

Flexion of thigh at hip, assists in extension of the lumbar spine

 

INNERVATION

Lumbar plexus (L2, 3, 4)

 

PRIMARY JOINT

Acetabular femoral joint

 

KEY STRENGTH TRAINING EXERCISES

Lunges

Striaght leg raises

 

NEW STRENGTH TRAINING EXERCISES

Standing hip flexion

Thomas stretch

 

COMMON INJURIES

Pain in lower back

Strain

 

 

 

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