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Risorius Muscle
Muscular System

Risorius Muscle

Musculus risorius

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Quick Facts

Origin: Parotid fascia.

Insertion: Modiolus and overlying skin of angle of mouth.

Action: Pulls angle of mouth laterally.

Innervation: Buccal branches of facial nerve (CN VII).

Arterial Supply: Superior labial artery.

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The risorius muscle originates from parotid fascia of the parotid gland and the masseter muscle.


The risorius muscle inserts into the apical portion of the modiolus of angulus oris, but can have many muscular bundles.


The risorius muscle pulls the angle of the mouth laterally. This action is used when laughing and grinning (Standring, 2016).

List of Clinical Correlates

- Bell’s palsy


Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series 41st edn.: Elsevier Limited.

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