Levator anguli oris

The levator anguli oris assists in nonverbal communication, as it helps the face form one of the most universally known expressions, the smile. The muscle elevates the angle of the mouth at the corner. There are two levator anguli oris muscles, each located symmetrically on either side of the mouth. When the two work at the same time, the corners of the mouth move upwards. However, many other muscles of the face assist in a smile, and each provides a different level of nuance. The levator anguli oris arises from the canine fossa, which is located under the infraorbital foramen. The muscle's fibers insert at the mouth's angle, and it intermingles with the zygomaticus, triangularis and orbicularis oris muscles. Also, the levator anguli oris originates in the maxilla bone and inserts into the modiolus, a chiasma of muscle found near the corners of the mouth. The muscle receives oxygenated blood from the facial artery, and the buccal branches of the facial nerve provides innervation.

Written and medically reviewed by the Healthline Editorial Team
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In Depth: Levator anguli oris

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