levator labii superiori

Examples of levator labii superiori in the following topics:

• Facial Muscles

  • The levator labii superioris alaeque nasi is the muscle of the upper lip.
  • The levator anguli oris (caninus) inserts at the corners of the mouth at an angle, and is associated with other muscles including the zygomaticus, triangularis, and orbicularis oris.
  • Located opposite to the levator anguli oris, it pulls the corners of the mouth downward, producing a frown.
  • The levator labii superioris is a broad muscle responsible for elevation of the upper lip.
  • The depressor labii inferioris is an analogous muscle that lowers the bottom lip.

• Oculomotor (III) Nerve

  • It enters the orbit via the superior orbital fissure and controls most of the eye's movements, including constriction of the pupil and maintaining an open eyelid by innervating the levator palpebrae superiors muscle.
  • The muscles it controls are the striated muscle in the levator palpebrae superioris and all extraocular muscles except for the superior oblique muscle and the lateral rectus muscle.
  • Sympathetic postganglionic fibers also join the nerve from the plexus on the internal carotid artery in the wall of the cavernous sinus and are distributed through the nerve, e.g., to the smooth muscle of levator palpebrae superioris.