Psoas major

Psoas major is a long fusiform muscle located on the side of the lumbar region of the vertebral column and brim of the lesser pelvis. It joins the iliacus muscle to form the iliopsoas which is commonly referred to as the body's most powerful hip flexor.

Anatomy

The psoas major originates from the 12th thoracic vertebra (T12) and the lumbar vertebrae. The muscle contributes to the formation of the iliopsoas by joining with the iliacus muscle at the level of the inguinal ligament to proceed towards the lesser trochanter of the femur.

Function

The psoas major performs several important functions in the human body. It is primarily responsible for flexing the hip and the lumbar spine. Additionally, it also plays a role in the external rotation of the hip. When the limb is fixed, it acts to bend the trunk forward, or to the side if the muscle on only one side is acting. It also plays a role in the stabilization of the hip and spine.

Clinical significance

The psoas major muscle can be implicated in several health conditions. A tight psoas major muscle can lead to lower back pain or hip pain. It can also be a source of pain in the groin or pelvis. In severe cases, a condition known as psoas syndrome can develop, which is characterized by a variety of symptoms including lower back pain, stiffness, and difficulty walking.

See also

• Psoas minor muscle
• Psoas abscess
• Psoas sign

Psoas major Resources
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