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Psoas minor
The psoas minor (Latin: musculus psoas minor) is a long and slim pelvic muscle lying on the anterior aspect of the psoas major muscle. It is located deep within the posterior abdominopelvic wall. The psoas minor stretches between the vertebral bodies of Th12 and L1 vertebrae and pubis of the hip bone. Although the psoas minor does not form the iliopsoas muscle complex, it belongs to the iliopsoas muscle group. The psoas minor is present only in around 60% of the population.
Psoas minor | |
Origin | Vertebral bodies of T12 and L1 vertebrae |
Insertion | Iliopubic eminence, pectineal line |
Action | Trunk flexion |
Innervation | Anterior ramus of spinal nerve L1 |
Blood supply | Lumbar arteries, lumbar branch of iliolumbar artery |
Origin
The psoas minor muscle originates from the vertebral bodies of the twelfth thoracic (Th12) and first lumbar (L1) vertebrae.
Insertion
The psoas minor inserts on the iliopubic eminence and pectineal line of the pubis.
Action
The psoas minor muscle provides flexion of the trunk.
Innervation
The psoas minor is innervated by the anterior ramus of the spinal nerve L1.
Blood supply
The psoas minor muscle receives arterial blood supply from the lumbar arteries and lumbar branch of the iliolumbar artery. The lumbar arteries arise from the abdominal aorta, while the iliolumbar artery is a branch of the internal iliac artery.
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