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 |