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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
