Psoas

Psoas Major

The 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 vertebrae (T12) and the lumbar vertebrae (L1-L5). It then runs down the lumbar region of the vertebral column, passes underneath the inguinal ligament and inserts into the lesser trochanter of the femur. Its primary actions are to flex the hip joint and flex the trunk.

Function

The psoas major plays an important role in maintaining upright posture, walking, and running. It is also involved in flexion and lateral rotation in the hip joint.

Clinical significance

A tight or overstretched psoas major muscle can lead to various problems such as lower back pain, hip pain, and pelvic tilt. It can also affect the alignment of the spine and the overall posture of the body.

See also

• Psoas minor muscle
• Iliopsoas
• Hip flexors

References

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External links

• Healthline: Psoas Major Muscle