Zygomaticus major muscle


The zygomaticus major is a muscle of the human body. It is a muscle of facial expression which draws the angle of the mouth superiorly and posteriorly to allow one to smile. Like all muscles of facial expression, the zygomatic major is innervated by the facial nerve, more specifically, the buccal and zygomatic branches of the facial nerve.

Structure

The zygomaticus extends from each zygomatic arch to the corners of the mouth.

Function

It raises the corners of the mouth when a person smiles. Usually a single unit, Dimples are caused by variations in form. It is thought that dimples are caused by bifid zygomaticus major muscle.

Image

Dimple