Zygomaticus major is a member of the buccolabial muscle group of the upper lip1. It joins with the fibers of levator anguli oris, orbicularis oris and the more deeply placed muscular bands to move the side of the mouth upwards and sideways during facial movements such as laughing.
- origin: in front of the zygomaticotemporal suture of the zygomatic bone
- insertion: angle of the mouth where it blends with the fibers of levator anguli oris, orbicularis oris and more deeply placed muscular bands
- draws the labial commissure (angle of the mouth) upwards and laterally (e.g. when laughing)
- 1. Gray's Anatomy, 41st Edition The Anatomical Basis of Clinical Practice Author : By Susan Standring, PhD, DSc ISBN : 9780702052309. Pg 494