(单选题)
人体头部的表情肌不包括（ ）。
A.额肌
B.笑肌
C.咬肌
D.颊肌
参考答案：C
参考解析：
面部肌肉分为咀嚼肌和表情肌两种类型。咀嚼肌包括颞肌和咬肌。表情肌包括：额肌、枕肌、眼轮匝肌、口轮匝肌、提上唇肌、提口角肌、颧肌、降口角肌、降下唇肌、颊肌等。B项，笑肌为微笑时运用的肌肉，广义的笑肌指提口角肌、降口角肌。C项，咬肌，属于咀嚼肌。故本题选C。
知识点：
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