Zygomaticus major muscle
Muscles of the head, face, and neck. Zygomaticus major shown in red.
|Origin||anterior of zygomatic|
|Insertion||modiolus of mouth|
|Nerve||zygomatic and buccal branches of the facial nerve|
|Actions||draws angle of mouth upward and laterally|
|Latin||musculus zygomaticus major|
|Anatomical terms of 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 (the seventh cranial nerve), more specifically, the buccal and zygomatic branches of the facial nerve.
The zygomaticus extends from each zygomatic arch (cheekbone) to the corners of the mouth.
It raises the corners of the mouth when a person smiles. Dimples may be caused by variations in the structure of this muscle as normally most of the people has a single united muscle.  It is thought that dimples are caused by bifid zygomaticus major muscle.
- Stel, Mariëlle; van Dijk, Eric; Olivier, Einav (2009). "You Want to Know the Truth? Then Don't Mimic!". Psychological Science. 20 (6): 694.
- "Dimple Creation – Cute as a button, who pays for a deformity?".
- "Zygomaticus Major Muscle Function, Origin & Anatomy".
- Pessa, Joel E.; Zadoo, Vikram P.; Garza, Peter A.; Adrian, Erle K.; Dewitt, Adriane I.; Garza, Jaime R. (1998). "Double or bifid zygomaticus major muscle: Anatomy, incidence, and clinical correlation". Clinical Anatomy. 11 (5): 310–313. doi:10.1002/(SICI)1098-2353(1998)11:5<310::AID-CA3>3.0.CO;2-T.
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