The Zygomaticus major muscle is a muscle that controls facial expression, drawing the mouth's angle posteriorly and superiorly The Zygomaticus major muscle is triggered by the Cranial Nerve VII. The Zygomaticus major muscle starts at the cheekbone and extends to the corners of the mouth. The Zygomaticus major muscle causes the corners of a person's mouth to rise when they smile. Variations of the Zygomaticus major muscle cause dimples to form. The Zygomaticus major muscle is a facial muscle. It begins in the anterior of the cheek and extends into the upper lip. The action of the muscle works to draw the lips upward and lateral. The facial nerves supply triggers to the Zygomaticus major muscle. The Zygomaticus major muscle is also known as musculus zygomaticus major and the greater zygomatic muscle, as well as musculus zygomaticus. Conditions that may affect the Zygomaticus major muscle include myalga, tears, strains, neuromuscular diseases, lacerations, contusions, Bell's palsy, atrophy, infectious myositis, and myopathy.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Zygomaticus major
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