psoas minor muscle

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pso·as mi·nor mus·cle

(sō'as mī'nŏr mŭs'ĕl)
An inconstant muscle, absent in about 40%; origin, bodies of twelfth thoracic and first lumbar vertebrae and disc between them; insertion, iliopubic eminence through iliopectineal arch (iliac fascia); action, assists in flexion of lumbar spine; nerve supply, lumbar plexus.
Synonym(s): musculus psoas minor, smaller psoas muscle.
References in periodicals archive ?
"Psoas Strength and Flexibility: Core Workouts to Increase Mobility, Reduce Injuries and End Back Pain" by certified physical therapist Pamela Ellgen is a profusely illustrated, 144 page, do-it-yourself instruction manual that includes fifty step-by-step exercises that can be done at home to increase physical mobility, reduce (and even end) back pain, and help heal injuries suffered by the psoas major and/or psoas minor muscle system.
OBSERVATIONS: In the present study, Psoas minor muscle was present in 40% (8/20 cases) cadavers studied: Bilateral in 35% (7/20 cases); & Unilateral in 5% (1/20 cases).
(1988) (9), as reported by Guerra (8), stated that insertion of Psoas minor muscle is by a thin tendon into the iliopectineal eminence, arcuate line, the iliac fascia & pectineal ligament.
An interesting morphological variation observed was that the fibres of psoas accessorius arising from deep surface of tendon of psoas minor muscle split into a superficial & a deeper layer.
CONCLUSION: Present study, conducted in 20 cadavers, showed the presence of Psoas Minor muscle in 40% cases (8/20 cases): Bilateral in 35% (7/20 cases); & Unilateral in 5% (1/20 cases).
QL resides in the area between psoas major and psoas minor muscles and the tendon of origin of transversus abdominis.