Obliquus capitis superior

  • The obliquus capitis superior (also obliquus capitis superior muscle, latin: musculus obliquus capitis superior) is one of the suboccipital muscles that acts at the atlanto-occipital joint.

    Origin

    The obliquus capitis superior originates from the transverse process of the atlas (C1).

    Insertion

    The fibers of the obliquus capitis superior insert onto the lateral half of the inferior nuchal line on the outer surface of the occipital bone.

    Action

    By bilateral contraction the obliquus capitis superior extends the head, while by unilateral contraction it flexes the head to the ipsilateral side.

    Innervation

    The obliquus capitis superior is innervated by the suboccipital nerve, which is the posterior ramus of the 1st cervical spinal nerve (C1).