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Interspinales lumborum

Other Terms: Interspinales lumborum, Interspinales lumborum set, Set of interspinales lumborum muscles, Musculi interspinales lumborum, Muscle interépineux des lombes

Muscle parts

None

Latin name

Musculi interspinales lumborum

Latin muscle parts

None

Group

Epaxial muscle – Interspinales

Etymology

The English name for this muscle is the muscle between the thorns or spines. The word interspinales comes from the Latin words inter meaning “between” and spina meaning “thorn.” This term was applied to pointed projections and in the 14th century was applied to the vertebral column with all its palpable spinous processes that form the dorsal line of the backbone. Lumborum comes from the Latin lumbus for “loin.”

Origin

Sides of the spinous processes of lumbar vertebrae one to four near their apex

Insertion

Sides of the spinous processes of lumbar vertebrae two to five near their apex

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 (L1 to L4)

Blood supply

Dorsal branches of the lumbar arteries from the aorta.

Latin

Musculi interspinales lumborum

French

Muscle interépineux des lombes

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