Zygomaticus major muscle

Origin The zygomaticus major muscle originates from the superior margin of the lateral surface of the temporal process of zygomatic bone, just anterior to the zygomaticotemporal suture. Insertion It inserts at the corner of the mouth by blending with the levator anguli oris muscle, the orbicularis oris muscle, and the deeper muscular structures. It is thought that cheek dimples are caused by bifid zygomaticus major muscle. == Function ==

The zygomaticus major muscle raises the upper lip to bare the upper teeth. It additionally deepens and raises the nasolabial furrow. Acting in conjunction with other muscles of facial expression that elevate the lip, it curls the upper lip to produce facial expressions such as smiling, disdain, contempt, or smugness. == Physiology ==

The average muscle can contract with a force of 200 g. == Clinical significance ==

The zygomaticus major muscle may be used in reconstructive surgery to replace lost tissue, such as with injuries to the lips. ==Additional images ==

File:Zygomaticus major muscle animation small.gif|Position of zygomaticus major muscle. Animation. File:Zygomaticus.png|Muscles of the head, face, and neck. Zygomaticus major shown in red. == See also ==