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Semispinalis thoracis

Other Terms: Musculus semispinalis thoracis, Muscle semi-épineux du thorax

Muscle parts

None

Latin name

Musculus semispinalis thoracis

Latin muscle parts

None

Group

Epaxial muscle – Transversospinales – Semispinalis

Etymology

The English name for this muscle is the half vertebral cloumn muscle of the thorax. The word semispinalis comes from the combined Latin word semis meaning “half” and 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

Transverse processes of T6 to T10

Insertion

Spinous processes of C6 to T4

Action

Extends the cervical vertebral column and rotates it to the opposite side.

Nerve supply

Dorsal rami of thoracic spinal nerves (T1 to T9)

Blood supply

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

Latin

Musculus semispinalis thoracis

French

Muscle semi-épineux du thorax

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