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Risorius

Anatomy

Origin:
Fascia over the masseter muscle.

Insertion:
Skin at the corner of the mouth.

Key Relations:
Thin superficial muscle in the upper group of oral muscles.

Pulls the corner of the mouth laterally and upwards.

e.g. when grinning..

Nerve Supply:
Buccal branch of the facial nerve (CN 7).

Blood Supply:
Superior labial branch of the facial artery.

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