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Orbicularis oris muscle. In human anatomy, the orbicularis oris muscle is a complex of muscles in the lips that encircles the mouth. Until recently, it was misinterpreted as a sphincter, or circular muscle, but it is actually composed of four independent quadrants that interlace and give only an appearance of circularity.
The facial muscles differ widely from the other skeletal muscles because they do not move joints but instead the skin. The muscles of the mouth are mainly responsible for the elevation and depression of the angle of the mouth, upper and lower lips and the opening and closure of the mouth.