Psoas minor muscle

Psoas minor muscle
Muscles of the iliac and anterior femoral regions. (Psoas minor visible near top right.)
Latin	m. psoas minor
Gray's	subject #127 467
Origin	Lateral surface bodies of T12 and L1 vertebrae and intervening intervertebral disc
Insertion	Pectineal line and iliopectineal eminence
Artery
Nerve	Anterior ramus of nerve L1
Actions	Weak trunk flexor
Antagonist	Gluteus maximus
MeSH	Psoas+Muscles

The psoas minor is a long, slender skeletal muscle which, when present, is located in front of the psoas major muscle. This muscle does not exist in about 40 to 50 percent of the human population.^[1][2]

Actions

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

Course

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]

Additional images

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  Right hip bone. Internal surface.

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  Right femur. Posterior surface.

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  Psoas minor muscle

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  Psoas minor muscle

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  Psoas minor muscle

Notes

References

• Bendavid, Robert; Abrahamson, Jack; Arregui, Maurice E. (2001). Abdominal Wall Hernias: Principle and Management. Springer. ISBN 0-387-95004-4. http://books.google.se/books?id=ai6fOllPH44C&pg=RA1-PA58. 
• 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. 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. 

External links

• LUC psmn
• -1254817712 at GPnotebook

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