The risorius and the buccinator muscles assist in the retraction of the lips, as well as support entrapment of air within the oral cavity.
笑和颊
帮助唇的收缩,
支撑了整个口腔的气
。
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Others may be less so, like the buccinator, a muscle that attaches your cheek to your teeth, or the body's tiniest skeletal muscle, a one-millimeter-long tissue fragment called the stapedius that's nestled deep inside the ear.
其他的肉我们就比较陌生了,比如
,
是
种把你的脸
连接到牙齿上的
肉,还有身体上最纤细的骨骼
,
片
毫米长的组织材料,叫做镫骨
,位于我们耳朵的深处。