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Rotatores lumborum

Other Terms: Rotatores lumborum, Lumbar rotator muscle, Musculi rotatores lumborum, Muscle rotateurs des lombes

Muscle parts

None

Latin name

Musculi rotatores lumborum

Latin muscle parts

None

Group

Epaxial muscle – Transversospinales – Rotatores

Etymology

The English name of this muscle is the muscle that turns (the vertebra) around in the loin region. Rotatores comes from the Latin verb rotatore meaning “to rotate,” which in turn comes from the Latin rota meaning “wheel.” The word lumborum comes from the Latin lumbus, which means the “loin.”

Origin

Mamillary process of lumbar vertebra

Insertion

Inferior margin on the lateral aspect of the lamina of the superjacent lumbar vertebra

Action

Possibly weakly assist with extension of the lumbar vertebrae. They are most likely proprioceptive transducers that monitor the position and movements of the vertebral column and provide feedback that influences the activity of the larger multisegmental muscles of the vertebral column.

Nerve supply

Dorsal rami of lumbar spinal nerves (L2 to L5)

Blood supply

Dorsal branches of the lumbar arteries from the aorta.

Latin

Musculi rotatores lumborum

French

Muscle rotateurs des lombes

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