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Posterior scalene

The posterior scalene (also posterior scalene muscle, latin: musculus scalenus posterior) is a muscle located in the lateral part of the neck. It is the smallest of the scalene muscles and situated most profoundly.

Origin

The posterior scalene originates from the posterior tubercles of the transverse processes of the 5th to 7th cervical vertebrae (C5 - C7).

Insertion

The posterior scalene inserts on the outer surface of the second rib.

Action

By contracting on both sides the posterior scalene flexes the neck forward. By contracting on one side it bends neck laterally. The posterior scalene lifts the second rib.

Innervation

The posterior scalene is innervated by the anterior rami of the 5th to 7th cervical spinal nerves (C5 - C7).