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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.
If the smile and frown are stripped down to basics, a minimum number of muscles can be defined. A smile where only the corners of the lip and the upper lip are raised uses five muscle pairs; two of them raise the upper lip and three of them raise the corners.