Where is the psoas major muscle located

It fuses with the iliacus muscle to form the iliopsoas muscle at the level of L5-S2 and passes inferiorly, deep to the inguinal ligament , to insert onto the lesser trochanter of the femur The lumbar plexus is embedded within the muscle and its branches emerge from it 3 :.

The psoas muscle is enclosed by the psoas fascia and it is this that retains the pus in a psoas abscess 3. The psoas fascia part of the iliac fascia invests the surface of the muscle, attached to the vertebral bodies, fibrous arches, and the transverse processes, and extends along the pelvic brim attached to the iliopubic eminence at the margins of the muscle.

The lateral edge blends with the anterior layer of the lumbar fascia over quadratus lumborum. The muscle comes to lie medial to and fuses with the iliacus muscle , such that inferiorly the two are often referred to together as the iliopsoas muscle 1,2. The psoas muscle is innervated by the lumbar plexus via branches from L1-L3 mainly L2 3. The action of this muscle is complex, acting to both laterally flex the lumbar spine as well as stabilize and flex the thigh 1,2.

The antagonist is the gluteus maximus. Lumbosacral triangle of Marcille :. From the Greek "psoa" meaning "loin" 3. The psoas muscle is referred to as the tenderloin by butchers. Anatomy: Abdominopelvic. Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Updating… Please wait. Unable to process the form.

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