psoas major muscle


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pso·as ma·jor mus·cle

(sō'as mā'jŏr mŭs'ĕl)
Groin muscle; origin, bodies of vertebrae and intervertebral discs from twelfth thoracic to fifth lumbar, and transverse processes of lumbar vertebrae; insertion, forms common insertion with iliacus muscle into lesser trochanter of femur; action, primary flexor of hip joint; nerve supply, lumbar plexus (ventral rami of first, second, and usually third lumbar spinal nerves).
Synonym(s): greater psoas muscle, musculus psoas major.

psoas major muscle

Thigh muscle. Origin: bodies of vertebrae T12-L1. Insertion: lesser trochanter of femur. Nerve: lumbar L1-L3. Action: flexes thigh.
See also: muscle
References in periodicals archive ?
The total RNA was extracted from the psoas major muscle using the Total RNA Kit I reagent (Omega Bio-Tek, Norcross, GA, USA) based on the manufacturer's protocol.
Seeping of injectate into the intrapsoas compartment, that is, the compartment between the anterior and posterior lamina of the psoas major muscle, and to the L2-L4 part of the lumbar plexus occurred in 89% of RPSC injection, 50% of PPC injection, and 40% of RC injection.
You will find the psoas major muscle half way between the anterior superior iliac spine and the navel.
WHEELER & KOOHMARAIE (1999) found slightly lower reduction in shear force from 1 to 10d and assign this due to the fact that the control psoas major muscle was already so tender that there was little room for improvement.
It is formed within the psoas major muscle, descends posterolaterally through the pelvis lateral to the femoral artery and vein, and then branches into terminal nerves that supply musculoskeletal structures that allow for thigh flexion, abduction, and lateral rotation from the hip joint.
The obturator nerve is formed within the psoas major muscle by the anterior divisions of the anterior primary rami of L2-L4 spinal nerves.
The nerve roots then run anteriorly to form the lumbar plexus, which lies between the quadratus lumborum and psoas major muscles. The plexus and branches then angle caudally to descend within the mass of the psoas major muscle, anterior to the transverse processes of the lumbar vertebrae.
The medial arcuate ligament of the diaphragm forms a fascial arch covering the psoas major muscle and blending with its fascia.
Apart from the above two branches, it gives small branches to psoas major muscle and neighboring lymph nodes.
INTRODUCTION: Psoas minor is a slender muscle of posterior abdominal wall, having short fleshy belly and long tendon, lying anterior to Psoas major muscle. It is found to be absent in 40% individuals.
The objective of this paper is to provide a brief case report followed by an evaluation of the literature on the psoas major muscle, specifically its anatomy, biomechanics and function, along with management strategies for psoas major dysfunction.