greater psoas muscle


A muscle with origin from the bodies of the vertebrae and the intervertebral disks from the twelfth thoracic to the fifth lumbar vertebrae and from the transverse processes of the lumbar vertebrae, with insertion into the femur, with nerve supply from the lumbar plexus, and whose action flexes the thigh.psoas major
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.