THE SHOUTING MOUTH: VERSION 1
When someone is angry and shouting, the mouth seems to compromise between the proper shape for the production of lots of noise and a desire to expose the upper, biting teeth. "Biting7' involves the sneering muscle (top)—the upward pull of the lip off the upper teeth. This may have evolved from a real threat to use the teeth, as in the lip-curling snarl of an angry dog or cat. "Producing lots of noise" requires shaping the lips for speech. The depressor labii inferioris and the orbicularis oris are working together here (bottom). The depressor labii is pulling the lower lip down in a U shape, exposing the lower teeth and gums. The orbicularis oris is contracting, giving the lips a straight, tight edge, important in loud speech. It curls the lips in on themselves; their tension makes both the sneer (top) and the lower-lip pull (middle) less obvious than otherwise.
ACTION OF SNEERING MUSCLE
ACTION OF LIP DEPRESSOR
Shouting mouth version 1: The angry mouth shows lots of teeth.
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