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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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