Zygomatic Major

The primary cheek muscle pulling lip corners upward during smiling.

Zygomatic major activation is necessary but not sufficient for Duchenne smiles — orbicularis oculi must co-activate.

See Also

Duchenne Smile →

Duchenne Smile

A genuine smile involving simultaneous activation of the zygomatic major (mouth) and orbicularis oculi (eyes).

Orbicularis Oculi

The circular muscle around the eye responsible for eye crinkling during genuine smiles.

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