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Psoas minor muscle

Long, slender skeletal muscle located anterior to the psoas major muscle

Long, slender skeletal muscle located anterior to the psoas major muscle

FieldValue
NamePsoas minor muscle
Latinmusculus psoas minor
ImageMusculus psoas minor.png
CaptionMuscles 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
ActionWeak trunk flexor
NerveAnterior ramus of nerve L1
AntagonistErector spinae

The psoas minor muscle ( or ; from ) is a long, slender skeletal muscle. When present, it is located anterior to the psoas major muscle.

Structure

The psoas minor muscle 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. It is posteriolateral to the iliopsoas muscle. Variations occur, however, and the insertion on the iliopubic eminence sometimes radiates into the iliopectineal arch.

The psoas minor muscle receives oxygenated blood from the four lumbar arteries (inferior to the subcostal artery) and the lumbar branch of the iliolumbar artery.

Innervation

The psoas minor muscle is innervated by direct branches of the lumbar spinal nerves.

Variation

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

Function

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

Other animals

The psoas minor muscle is present in other mammals, such as horses. In horses, it may be palpated during rectal exams to check for causes of back pain.

Additional images

File:Gray236.png|Right hip bone, internal surface File:Gray245.png|Right femur, posterior surface File:Slide4nn.JPG|Psoas minor muscle File:Slide9pp.JPG|Psoas minor muscle File:Slide6ppp.JPG|Psoas minor muscle

Notes

References

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References

  1. Tank (2005), p 93
  2. Gray (2008), p 1372
  3. Bendavid (2001), p 58
  4. Zwingenberger, Allison. (2015-01-01). "Chapter 14 - Musculoskeletal System". W.B. Saunders.
  5. Platzer (2004), p 234
  6. Gardner, ERNEST D.. (2005-01-01). "Chapter 2 - Gross Anatomy of the Peripheral Nervous System". W.B. Saunders.
  7. 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
  8. Haussler, Kevin K.. (2014-01-01). "21 - Back and pelvis". W.B. Saunders.
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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