Medical Definition of Smaller psoas muscle
An inconstant muscle, absent in about 40%; origin, bodies of twelfth thoracic and first lumbar vertebrae and disk between them; insertion, iliopubic eminence via iliopectineal arch (iliac fascia); action, assists in flexion of lumbar spine; nerve supply, lumbar plexus.
Synonym: musculus psoas minor, smaller psoas muscle.
(05 Mar 2000)
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