Zygomaticus major muscle

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Zygomaticus major
Sobo 1909 260 - Zygomaticus major muscle.png
Muscles of the head, face, and neck. Zygomaticus major shown in red.
Origin anterior of zygomatic
Insertion modiolus of mouth
Artery facial artery
Nerve zygomatic and buccal branches of the facial nerve
Actions draws angle of mouth upward and laterally
Latin musculus zygomaticus major
TA A04.1.03.029
FMA 46810
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.[1] 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.[2][3] It is thought that dimples are caused by bifid zygomaticus major muscle.[4]


See also[edit]


  1. ^ Stel, Mariëlle; van Dijk, Eric; Olivier, Einav (2009). "You Want to Know the Truth? Then Don't Mimic!". Psychological Science. 20 (6): 694. doi:10.1111/j.1467-9280.2009.02350.x. 
  2. ^ "Dimple Creation – Cute as a button, who pays for a deformity?". 
  3. ^ "Zygomaticus Major Muscle Function, Origin & Anatomy". 
  4. ^ 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. PMID 9725574. doi:10.1002/(SICI)1098-2353(1998)11:5<310::AID-CA3>3.0.CO;2-T. 

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