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Longissimus thoracis

Other Terms: Musculus longissimus thoracis, Muscle longissimus du thorax

Muscle parts

Lumbar part or medial division of lumbar erector spinae; Thoracic part

Latin name

Musculus longissimus thoracis

Latin muscle parts

Pars lumbalis or divisio medialis musculus erectores spinae lumborum; Pars thoracica

Group

Epaxial muscle – Erector spinae – Longissimus

Etymology

The English name for this muscle is the longest muscle of the thorax. The word longissimus is Latin for the “longest.” The word thoracis comes from the Greek thorakos meaning “breast plate or chest.”

Origin

Medial part of posterior iliac crest and spinous processes from L3 to posterior sacrum between median crest and lateral crest

Insertion

Base of transverse process and adjacent accessory process of L1 to L5 and two tendinous slips to the tips of each transverse process and adjacent rib from T1 to T12

Action

Extend the vertebral column.

Nerve supply

Dorsal rami of thoracic and lumbar spinal nerves (T7 to L5)

Blood supply

Dorsal branches of the posterior intercostal arteries from the thoracic aorta.

Latin

Musculus longissimus thoracis

French

Muscle longissimus du thorax

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