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Corpus: Psoas major muscle

1. Definition

The psoas major muscle is a skeletal muscle that is part of the inner hip musculature. Functionally, it combines with the iliacus muscle to form the iliopsoas muscle.

2. Origin

The psoas major muscle has two layers of origin. The superficial layer originates from the twelfth thoracic vertebral body (T12), the first four lumbar vertebral bodies (L1 to L4), and the associated intervertebral discs. The deep layer originates from the transverse processes of the first to fifth lumbar vertebrae. The muscle has a close anatomical relationship with the lumbar plexus.

3. Insertion

Together with the iliacus muscle, the psoas major muscle inserts at the lesser trochanter of the femur.

4. Peculiarities

The psoas major muscle shares a common fascial sheath with the iliacus muscle and passes through the muscular compartment. It is also notable for being visible on X-ray images, a feature not common to all muscles.

5. Innervation

The psoas major muscle is innervated by the femoral nerve and by direct branches from the lumbar plexus (L1-L4).

6. Function

In the hip joint, the psoas major muscle is primarily responsible for flexion, making it the strongest hip flexor in humans. Depending on the starting position, it also contributes to internal or external rotation of the hip.

Stichworte: Corpus, Muscle, Pelvis, Spine
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Isabel Keller
DocCheck Team
Natascha van den Höfel
DocCheck Team
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Letzter Edit:
21.08.2024, 08:01
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