Psoas minor muscle
Muscles of the iliac and anterior femoral regions (psoas minor visible near top right)
Details
Origin	Lateral surfacebodies of T12 and L1vertebrae and interveningintervertebral disc
Insertion	Pectineal line andiliopubic eminence
Nerve	Anterior ramus of nerve L1
Actions	Weak trunkflexor
Antagonist	Erector spinae
Identifiers
Latin	musculus psoas minor
TA98	A04.7.02.005
TA2	2596
FMA	22350
Anatomical terms of muscle [edit on Wikidata]

Thepsoas minor muscle (/ˈsoʊ.əs/ or/ˈsoʊ.æs/; fromAncient Greek:ψόᾱ,romanized: psóā,lit. 'muscles of the loins') is a long, slenderskeletal muscle.^[1][2] When present, it is located anterior to thepsoas major muscle.^[1][2]

The psoas minor muscle originates from the verticalfascicles inserted on the lastthoracic and firstlumbar vertebrae. From there, it passes down onto the medial border of the psoas major, and is inserted to theinnominate line and theiliopectineal eminence. Additionally, it attaches to and stretches the deep surface of theiliac fascia and occasionally its lowermost fibers reach theinguinal ligament.^[3] It is posteriolateral to theiliopsoas muscle.^[4] Variations occur, however, and the insertion on the iliopubic eminence sometimes radiates into theiliopectineal arch.^[5]

The psoas minor muscle receives oxygenated blood from the fourlumbar arteries (inferior to the subcostal artery) and the lumbar branch of theiliolumbar artery.^{[citation needed]}

The psoas minor muscle isinnervated by direct branches of thelumbar spinal nerves.^[6]

The psoas minor muscle is considered inconstant and is often absent, only being present in about 40% of human specimens studied.^[7] 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.

The psoas minor muscle is present in othermammals, such ashorses.^[8] In horses, it may be palpated duringrectal exams to check for causes ofback pain.^[8]

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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

Wikimedia Commons has media related toPsoas minor muscles.

• 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.

• Hip flexors
• Hip muscles
• Spine flexors
• Muscles of the lower limb

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• Short description matches Wikidata
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