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).