Psoas minor muscle

Last revised by Reabal Najjar on 15 Dec 2022

Psoas minor muscle is a thin muscle with a long tendon lying on the anterior aspect of the psoas major muscle. It is located deep within the posterior abdominopelvic wall. The psoas minor is functionally insignificant compared to psoas major. It is present in ~60% (range 50-67%) of the population 1-2.


  • origin: T12 and L1 vertebral bodies and intervening IV disc

  • insertion: passes behind the inguinal ligament to insert into the iliopubic eminence

  • blood supply: lumbar arteries, lumbar branch of iliolumbar artery

  • nerve supply: L1 nerve root

  • action: lumbar spine flexion

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Cases and figures

  • Figure 1: Gray's illustration
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