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Psoas major

Psoas major muscle
Psoas major muscle11.png
Position of psoas major (shown in red)
Anterior Hip Muscles 2.PNG
The psoas major and nearby muscles
Details
Origin Transverse processes of T12-L5 and the lateral aspects of the discs between them
Insertion In the lesser trochanter of the femur
Artery lumbar branch of iliolumbar artery
Nerve Lumbar plexus via anterior branches of L1-L3 nerves
Actions Flexion in the hip joint
Antagonist Gluteus maximus
Identifiers
Latin Musculus psoas major
MeSH A02.633.567.825
TA A04.7.02.004
FMA 18060
Anatomical terms of muscle
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The psoas major (/ˈs.əs/ or /ˈs.æs/) (from Greek: ψόας - psóās : 'of the loins', genitive singular form of ψόα - psóa 'the loins') is a long 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.

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. The lumbar plexus lies between the two layers.

The iliacus and psoas major form the iliopsoas, which is surrounded by the iliac fascia. The iliopsoas runs across the iliopubic eminence through the muscular lacuna to its insertion on the lesser trochanter of the femur. The iliopectineal bursa separates the tendon of the iliopsoas muscle from the external surface of the hip joint capsule at the level of the iliopubic eminence. The iliac subtendinous bursa lies between the lesser trochanter and the attachment of the iliopsoas.


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