Psoas minor muscle

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Gray's anatomy image 245

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== Psoas Minor Muscle ==

The psoas minor muscle is a long, slender skeletal muscle located in the anterior compartment of the abdomen. It is a part of the iliopsoas group, which also includes the psoas major muscle and the iliacus muscle. The psoas minor muscle is often absent in a significant portion of the population, with studies suggesting it is missing in about 40-60% of individuals.

Anatomy

The psoas minor muscle originates from the sides of the T12 and L1 vertebrae and their intervertebral disc. It descends along the anterior surface of the psoas major muscle and inserts into the pectineal line and the iliopubic eminence of the pelvis.

Function

The primary function of the psoas minor muscle is to assist in the flexion of the lumbar spine. It helps in stabilizing the pelvis and the lumbar region, contributing to the overall posture and movement of the trunk.

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, which are branches of the abdominal aorta.

Clinical Significance

Due to its variability in presence, the psoas minor muscle is not often a focus in clinical practice. However, when present, it can be involved in conditions such as psoas syndrome and may be considered during surgical procedures involving the lumbar spine or pelvis.

Related Pages

• Psoas major muscle
• Iliacus muscle
• Iliopsoas
• Lumbar spine
• Pelvis
• Abdominal aorta