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Psoas minor muscle
Last reviewed: 23.04.2024
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The small lumbar muscle (m.psoas minor) is unstable, absent in 40% of cases. It begins on the intervertebral disc and adjacent to it the edges of the XII thoracic and I lumbar vertebrae. The muscle is located on the anterior surface of the large lumbar muscle, fused to the fascia covering it. The thin abdomen of this muscle passes into a long tendon, which is attached to the arcuate line of the ilium and to the ilio-pubic elevation. Part of the bundles of the tendon of this muscle is intertwined in the iliac fascia and in the iliac crest.
Function of the small lumbar muscle: stretches the iliac fascia, increasing the support for the ilio-lumbar muscle.
Innervation of the small lumbar muscle: muscle branches of the lumbar plexus (LI-LIV).
Blood supply to the small lumbar muscle: lumbar arteries.
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