Zygomaticus major muscle

The zygomaticus major muscle is a member of the buccolabial muscle group of the upper lip. 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.


Blood supply



  • draws the labial commissure (angle of the mouth) backward, upwards and laterally (e.g. when laughing and smiling).

See also