quadratus lumborum muscle


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quadratus lumborum

An abdominal muscle located at the iliac crest, iliolumbar ligaments, transverse processes of lower lumbar vertebrae.

Action
Abduction of trunk.
 
Nerve
Ventral branches of upper lumbar spinal nerves.

Insertion
12th rib, transverse processes of upper lumbar vertebrae.

quad·ra·tus lum·bo·rum mus·cle

(kwah-drā'tŭs lŭm-bō'rŭm mŭs'ĕl)
Origin, iliac crest, iliolumbar ligament, and transverse processes of lower lumbar vertebrae; insertion, twelfth rib and transverse processes of upper lumbar vertebrae; action, abducts trunk; nerve supply, ventral primary rami of upper lumbar spinal nerves.
Synonym(s): musculus quadratus lumborum [TA] .
References in periodicals archive ?
When she puts her leg on the barre, she keeps it no higher than 90 degrees and adds in a side cambre to get at her quadratus lumborum muscle in her lower back which sometimes gets tight.
This can be accomplished by hiking the contralateral hip by contracting the quadratus lumborum muscle.
Furthermore the iliolumbar ligament is closely associated with the lower attachments of the anterior and middle layers of the thoracolumbar fascia and the quadratus lumborum muscle (Bogduk 1997; Frazer 1940; Fujiwara et al.