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Psoas Major
Region: Abdominal & Pelvic Muscles · All abdominal & pelvic muscles
Psoas Major at a glance
| Origin | Bodies and transverse processes of T12–L5 vertebrae |
|---|---|
| Insertion | Lesser trochanter of the femur (with iliacus, as iliopsoas) |
| Actions | Flexes the thigh at the hip; Flexes the trunk when the thigh is fixed |
| Nerve supply | Ventral rami of L1–L3 |
◆ Good to know
Its upper part belongs to the abdomen and its action to the hip; a psoas abscess (classically from spinal tuberculosis) can track down beneath the inguinal ligament into the groin.
More Abdominal & Pelvic Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.