Psoas minor muscle

The psoas minor muscle is a long, slender skeletal muscle located in the anterior compartment of the lumbar region of the vertebral column. It is a variable muscle, meaning it is not present in all individuals.

Anatomy

The psoas minor muscle originates from the lateral surfaces of the T12 and L1 vertebrae and their intervertebral disc. It inserts into the pectineal line of the pubis and the iliopectineal eminence.

Innervation

The psoas minor muscle is innervated by the anterior rami of the L1 spinal nerve.

Blood Supply

The blood supply to the psoas minor muscle is provided by the lumbar arteries.

Function

The primary function of the psoas minor muscle is to assist in the weak flexion of the lumbar spine. It acts as a stabilizer for the pelvis and lumbar region.

Clinical Significance

The psoas minor muscle is often absent in a significant portion of the population, with studies suggesting its presence in about 40-60% of individuals. Its absence does not typically result in any functional deficit due to the compensatory actions of other muscles in the region.

See Also

• Psoas major muscle
• Iliacus muscle
• Lumbar plexus
• Hip flexors