Orbital part of orbicularis oculi

  • The orbital part of the orbicularis oculi (latin: pars orbitalis musculi orbicularis oculi) is a part of the orbicularis oculi muscle that lies circulary around the orbital opening.

    Origin

    The orbital part of the orbicularis oculi originates from the medial palpebral ligament.

    Insertion

    Fibers of the orbital part of the orbicularis oculi run around the orbital opening and insert into the origin site.

    Action

    Contractions of the orbital part of the orbicularis oculi narrow the space between the eyelids.

    Innervation

    The orbital part of the orbicularis oculi is innervated by the temporal branch and the zygomatic branch of the facial nerve (CN VII).