quadratus lumborum muscle


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] .