Psoas minor muscle

Last revised by Assoc Prof Craig Hacking on 25 Aug 2021

Psoas minor muscle is a thin muscle with a long tendon and is functionally insignificant compared to psoas major. It is present in ~60% (range 50-67%) of the population 1-2.

Summary

  • origin: T12 and L1 vertebral bodies and intervening IV disc
  • insertion: passes behind the inguinal ligament to insert into the iliopubic eminence
  • 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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