psoas minor (muscle)
an inconstant muscle, absent in about 40%; origin, bodies of twelfth thoracic and first lumbar vertebrae and disc between them; insertion, iliopubic eminence via iliopectineal arch (iliac fascia); action, assists in flexion of lumbar spine; nerve supply, lumbar plexus.
Synonym(s): musculus psoas minorTA, smaller psoas (muscle)
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