Psoas minor muscle

The psoas minor is a long, slender skeletal muscle which, when present, is located anterior to the psoas major muscle.[1][2]

Psoas minor muscle
Muscles of the iliac and anterior femoral regions (psoas minor visible near top right)
OriginLateral surface bodies of T12 and L1 vertebrae and intervening intervertebral disc
InsertionPectineal line and iliopubic eminence
NerveAnterior ramus of nerve L1
ActionsWeak trunk flexor
AntagonistErector Spinae
LatinMusculus psoas minor
Anatomical terms of muscle


Psoas minor originates from the vertical fascicles inserted on the last thoracic and first lumbar vertebrae. From there, it passes down onto the medial border of the psoas major, and is inserted to the innominate line and the iliopectineal eminence. Additionally, it attaches to and stretches the deep surface of the iliac fascia and occasionally its lowermost fibers reach the inguinal ligament.[3] Variations occur, however, and the insertion on the iliopubic eminence sometimes radiates into the iliopectineal arch.[4]

The psoas minor is supplied by the four lumbar arteries (inferior to the subcostal artery) and the lumbar branch of the iliolumbar artery.


The psoas minor is considered inconstant and is often absent, only being present in about 40% of human specimens studied.[5] It has an average length of about 24 cm, of which about 7.1 cm is muscle tissue and about 17 cm is tendon.


The psoas minor is a weak flexor of the lumbar vertebral column.

Additional images


  1. Tank (2005), p 93
  2. Gray (2008), p 1372
  3. Bendavid (2001), p 58
  4. Platzer (2004), p 234
  5. Mcg Farias (1 Jan. 2012). Morphological and morphometric analysis of Psoas Minor Muscle in cadavers. ResearchGate. Retrieved from


  • Bendavid, Robert; Abrahamson, Jack; Arregui, Maurice E. (2001). Abdominal Wall Hernias: Principle and Management. Springer. ISBN 0-387-95004-4.
  • Platzer, Werner (2004). Color Atlas of Human Anatomy, Vol 1: Locomotor system (5th ed.). Thieme. ISBN 3-13-533305-1. (ISBN for the Americas 1-58890-159-9.)
  • Tank, Patrick W. (2005). Grant's Dissector (13th ed.). Hagerstown, MD: Lippincott Williams & Wilkins. ISBN 0-7817-5484-4.
  • Gray, Henry; Standring, Susan (2008). Gray's Anatomy - The Anatomical Basis of Clinical Practice (40th ed.). Churchill Livingstone - Elsevier. ISBN 978-0-443-06684-9.
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