Psoas Minor

The psoas minor is a muscle of the posterior abdominal wall. It is a long thin muscle, located anterior to the psoas major. It is only present in 60% of the population.

• Attachments: Originates from the vertebral bodies of T12 and L1 and attaches to a ridge on the superior ramus of the pubic bone, known as the pectineal line.

• Actions: Flexion of the vertebral column.

• Innervation: Anterior rami of the L1 spinal nerve.
• Blood supply: Lumbar arteries.

By TeachMeSeries Ltd (2025)

Fig 1
Muscles of the posterior abdominal wall.