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Spinalis thoracis

Other Terms: Musculus spinalis thoracis, Muscle épineux du thorax

Muscle parts

None

Latin name

Musculus spinalis thoracis

Latin muscle parts

None

Group

Epaxial muscle – Erector spinae – Spinalis

Etymology

The English name for this muscle is the muscle on the spines of the vertebrae in the thoracic region. Spinalis comes from the Latin 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. The word thoracis comes from the Greek thorakos meaning “breast plate or chest.”

Origin

Sides of the spinous processes of T11 to L2

Insertion

Sides of the spinous processes of T1 to T8

Action

Extension of the vertebral column.

Nerve supply

Dorsal rami of thoracic and lumbar spinal nerves (T4 to L1)

Blood supply

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

Latin

Musculus spinalis thoracis

French

Muscle épineux du thorax

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