| Muscle Function & Other Pertinent Medical Information | | — ORBICULARIS ORIS
— | | ORIGIN —
Near midline on anterior surface of maxilla and mandible and modiolus at angle of mouth
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| INSERTION —
Mucous membrane of margin of lips and raphe with buccinator at modiolus
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| ACTION —
Narrows orifice of mouth, purses lips and puckers lip edges
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| NERVE —
Accessory parts are incisivus labii superioris and inferioris
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