Psoas minor muscle

Psoas minor muscle

Muscles of the iliac and anterior femoral regions (psoas minor visible near top right)
Details
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
Identifiers
Latin Musculus psoas minor
MeSH A02.633.567.825
Dorlands
/Elsevier
m_22/12550283
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]

Structure

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]

Morphology

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.

Function

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

Additional images

Notes

  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 https://www.researchgate.net/publication/280236296_Morphological_and_morphometric_analysis_of_Psoas_Minor_Muscle_in_cadavers

References

Wikimedia Commons has media related to Psoas minor muscles.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.