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Interspinales thoracis

Other Terms: Interspinales thoracis, Interspinales thoracis set, Set of interspinales thoracis muscles, Musculi interspinales thoracis, Muscle interépineux du thorax

Muscle parts

None

Latin name

Musculi interspinales thoracis

Latin muscle parts

None

Group

Epaxial muscle – Interspinales

Etymology

The English name for this muscle is the muscle between the thorns or spines. The word interspinales comes from the Latin words inter meaning “between” and 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

Side of the apex of the spinous process of twelfth, third, and second thoracic vertebrae

Insertion

Side of the apex of the spinous process of the eleventh, second, and first thoracic vertebrae

Action

Possibly weakly assist with extension of the thoracic vertebrae. They are most likely proprioceptive transducers that monitor the position and movements of the vertebral column and provide feedback that influences the activity of the larger multisegmental muscles of the vertebral column.

Nerve supply

Dorsal rami of thoracic spinal nerves (T1, T2, and T11)

Blood supply

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

Latin

Musculi interspinales thoracis

French

Muscle interépineux du thorax

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