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Psoas Minor
The psoas minor is a long, slender skeletal muscle that is absent in about 40% of the population. When present, the psoas minor is placed in front of the psoas major muscle.
Anatomy of the Psoas Minor
The psoas minor is antagonist to the gluteus maximus and innervation is by the lumbar plexus.
The 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, the psoas minor attaches to and stretches the deep surface of the iliac fascia and, occasionally, its lowermost fibers reaches the inguinal ligament.
Functions of the Psoas Minor
The psoas minor is absent in many individuals and thus its function is limited. It functions as a weak trunk flexor.
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