Objective: To study the distribution of temporal branches of facial nerve at the upper part of orbicularis oculi muscle.

目的：观测面神经颞支在眼轮匝肌上部的分布特点。

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And they mean it: they smile with their eyes (a contraction of the orbicularis oculi facial muscles), not just their mouths.

这意味着：他们用眼睛微笑(面部上睑提肌肌肉的收缩)，而不仅仅是他们的嘴。

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Similarly, Duchenne identified a genuine smile as using the orbicularis oculi muscle around the eyes which cannot easily be consciously manipulated.

类似地，杜兴认为真实的笑容需要牵动眼部周围的轮匝肌，而这是无法有意控制的。

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