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Psoas major

Other Terms: Iliopsoas, Groin muscles, Psoas major muscle, Musculus psoas major, Muscle grand psoas

Muscle parts

None

Latin name

Musculus iliopsoas – Musculus psoas major

Latin muscle parts

None

Group

Hip joint muscle – hip flexor group or Abdominal wall – subvertebral muscle

Etymology

The English name for this muscle is the greater muscle of the loin region. The word psoas comes from the Greek psoa meaning the “loin region.” The term major comes from the Latin maior meaning “greater.” As is typical in anatomical terminology, this comparative reference clues you into the fact that this is a larger version of a similar placed smaller muscle.

Origin

Transverse processes of lumbar vertebrae and lateral aspect of lumbar vertebral bodies

Insertion

Lesser trochanter of the femur

Action

Powerful flexor of the hip; weak lateral rotator of the hip joint; Extends the lumbar vertebral column (deepening the lumbar curve) to maintain posture

Nerve supply

Branches from the ventral rami of lumbar spinal nerves (L1, L2, and L3) before they join to form the lumbar plexus.

Blood supply

The muscle receives blood from the four lumbar arteries from the aorta, from small branches of the renal arteries, from small muscular branches of the common iliac artery, and from the deep circumflex iliac artery.

Latin

Musculus psoas major

French

Muscle grand psoas

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