View source for Psoas

== Psoas ==
'''Psoas''' (/ˈsoʊ.æs/), also known as the '''psoas major''' or '''lumbar psoas''', is a long fusiform muscle located in the lateral lumbar region between the vertebral column and the brim of the lesser pelvis. It joins the [[iliacus muscle]] to form the [[iliopsoas]] which is responsible for flexing the hip joint.

=== Etymology ===
The term "psoas" originates from the Greek word "psoa", meaning "loin". 

=== Anatomy ===
The psoas major is divided into a superficial and a deep part. The deep part attaches to the sides of the bodies of the twelfth thoracic and all lumbar vertebrae and intervertebral discs. The superficial part attaches to the transverse processes of all lumbar vertebrae. Both parts unite and form a single muscle belly distally. 

The psoas major unites with the [[iliacus muscle]] at the level of the inguinal ligament to form the [[iliopsoas]] which is inserted into the lesser trochanter of the [[femur]]. This common insertion point is the psoas tendon. 

=== Function ===
The psoas major and the [[iliacus muscle]] are powerful hip flexors. They are also important for maintaining proper posture. 

=== Related Terms ===
* [[Iliopsoas]]
* [[Iliacus muscle]]
* [[Lumbar vertebrae]]
* [[Femur]]
* [[Inguinal ligament]]

=== See Also ===
* [[Muscular system]]
* [[Anatomy]]
* [[Physiology]]

[[Category:Anatomy]]
[[Category:Muscular system]]
[[Category:Medical terminology]]

{{dictionary-stub}}