orbicularis oris muscle


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or·bi·cu·la·ris o·ris mus·cle

(ōr-bik'yū-lā'ris ō'ris mŭs'ĕl)
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 oris [TA] .

orbicularis oris muscle

Facial muscle. Origin: adjacent facial muscles that surround mouth. Insertion: into itself and skin of lips while encircling mouth. Nerve: facial (CN VII). Action: closes and purses lips.
See: face and headfor illus.
See also: muscle

or·bi·cu·la·ris o·ris mus·cle

(ōr-bik'yū-lā'ris ō'ris mŭs'ĕl)
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 oris [TA] .
References in periodicals archive ?
On the basis of the above mentioned findings in this study, the conclusion may be drawn that yielding effect of lips, because of relaxed orbicularis oris muscle and greater lip vermilion is the contributing factor in the development of bimaxillary dento alveolar protrusion.
A cheek-temple flap is elevated medially to the level of the nasolabial fold and orbicularis oris muscle, which is dissected circumferentially from the surrounding skin and mucosa.
In the opinion of Linder-Aronson [8] (1974), the need to keep the lips open to breathe in mouth breathers would lead to a change in the tension of the orbicularis oris muscle. However, regardless of the cause-effect relationship suggested, all aforementioned authors unanimously established relationships between the muscle activity and the breathing mode.
MOUTH LIFT THIS works the orbicularis oris muscle which encircles the mouth, as well as the muscles in the cheeks, around the eyes, and the forehead.
Minimal functional recovery of the orbicularis oculi and orbicularis oris muscles was observed 5 months post-injury.