Psoas minor muscle

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Psoas minor muscle
Musculus psoas minor.png
Muscles of the iliac and anterior femoral regions (psoas minor visible near top right)
Origin Lateral surface bodies of T12 and L1 vertebrae and intervening intervertebral disc
Insertion Pectineal line and iliopubic eminence
Nerve Anterior ramus of nerve L1
Actions Weak trunk flexor
Antagonist Gluteus maximus
Latin Musculus psoas minor
MeSH A02.633.567.825
TA A04.7.02.005
FMA 22350
Anatomical terms of 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 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 considered inconstant and is often absent, only being present in about 27% of human specimens studied. [5] It has an average length of about 24cm, of which about 7.1cm is muscle tissue and about 17cm is tendon.


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

Additional images[edit]


  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