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orbicularis oris (muscle)

 

Definition: facial muscle of mouth; origin, by nasolabial band from septum of the nose, by superior incisive bundle from incisor fossa of maxilla, by inferior incisive bundle from lower jaw each side of symphysis; insertion, fibers surround mouth between skin and mucous membrane of lips and cheeks, and are blended with other muscles; action, closes lips; nerve supply, facial.

Synonym(s): musculus orbicularis orisTA, musculus sphincter oris, orbicular muscle of mouth, sphincter oris

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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