Medical Definition of Sphincter oris
1.
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, fibres surround mouth between skin and mucous membrane of lips and cheeks, and are blended with other muscles; action, closes lips; nerve supply, facial.
Synonym: musculus orbicularis oris, musculus sphincter oris, orbicular muscle of mouth, sphincter oris.
(05 Mar 2000)
Lexicographical Neighbors of Sphincter Oris
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