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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
