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orbicularis oris

   Also found in: Wikipedia 0.01 sec.
orbicularis oris,
the muscle surrounding the mouth. It consists partly of fibers derived from other facial muscles such as the buccinator that are inserted into the lips and partly of fibers proper to the lips. It serves to close and purse the lips.


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The movement of the lips is made possible by the lip muscle called the orbicularis oris.
The orbicularis oris is gradually freed from the other perioral muscles (muscles of facial expression) in order to maximize advancement of the flap.
Contraction of orbicularis oris tenses the lips and reduces their aversion.
 
 
 
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