微笑是如何控制我们所有人的
<p><span word="The">The</span> <span word="neuronal">neuronal</span> <span word="signals">signals</span> <span word="for">for</span> <span word="smiles">smiles</span> <span word="usually">usually</span> <span word="start">start</span> <span word="in">in</span> <span word="the">the</span> <span word="cortex">cortex</span> <span word="of">of</span> <span word="our">our</span> <span word="brain">brain</span>. <span word="From">From</span> <span word="there">there</span> <span word="they">they</span> <span word="travel">travel</span> <span word="to">to</span> <span word="the">the</span> <span word="deeper">deeper</span> <span word="part">part</span>, <span word="the">the</span> <span word="brainstem">brainstem</span> -- <span word="which">which</span>, <span word="in">in</span> <span word="terms">terms</span> <span word="of">of</span> <span word="evolution">evolution</span>, <span word="also">also</span> <span word="happens">happens</span> <span word="to">to</span> <span word="be">be</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="oldest">oldest</span> <span word="parts">parts</span> <span word="of">of</span> <span word="our">our</span> <span word="brain">brain</span>. <span word="From">From</span> <span word="there">there</span>, <span word="a">a</span> <span word="nerve">nerve</span> <span word="that">that</span>'<span word="s">s</span> <span word="large">large</span> <span word="enough">enough</span> <span word="to">to</span> <span word="be">be</span> <span word="visible">visible</span> <span word="to">to</span> <span word="the">the</span> <span word="naked">naked</span> <span word="eye">eye</span>, <span word="called">called</span> <span word="the">the</span> <span word="seventh">seventh</span> <span word="cranial">cranial</span> <span word="nerve">nerve</span>, <span word="carries">carries</span> <span word="the">the</span> <span word="signal">signal</span> <span word="in">in</span> <span word="front">front</span> <span word="of">of</span> <span word="the">the</span> <span word="ear">ear</span> <span word="to">to</span> <span word="the">the</span> <span word="more">more</span> <span word="central">central</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="face">face</span>, <span word="where">where</span> <span word="it">it</span> <span word="reaches">reaches</span> <span word="the">the</span> <span word="smile">smile</span> <span word="muscle">muscle</span>.</p><p>微笑的神经信号通常开始于我们的大脑皮质。他们从那里传输到更深的部分，脑干——它从进化的角度来讲，也恰好是我们的大脑最古老的部分之一。从那里，一根可以大到肉眼可见的称为第七脑神经的神经，把耳朵前面的信号传到面部更中央的部分，那里它可以到达微笑肌。</p><p><span word="The">The</span> <span word="smile">smile</span> <span word="muscle">muscle</span> <span word="is">is</span> <span word="attached">attached</span> <span word="from">from</span> <span word="the">the</span> <span word="mouth">mouth</span> <span word="to">to</span> <span word="the">the</span> <span word="cheekbone">cheekbone</span>. <span word="When">When</span> <span word="this">this</span> <span word="nerve">nerve</span> <span word="fires">fires</span>, <span word="the">the</span> <span word="muscle">muscle</span> <span word="is">is</span> <span word="activated">activated</span>, <span word="the">the</span> <span word="corners">corners</span> <span word="of">of</span> <span word="our">our</span> <span word="mouth">mouth</span> <span word="are">are</span> <span word="pulled">pulled</span> <span word="up">up</span>, <span word="and">and</span> <span word="we">we</span> <span word="look">look</span> <span word="happy">happy</span>. <span word="And">And</span> <span word="if">if</span> <span word="it">it</span> <span word="is">is</span> <span word="a">a</span> <span word="true">true</span> <span word="smile">smile</span>, <span word="one">one</span> <span word="that">that</span> <span word="signifies">signifies</span> <span word="real">real</span> <span word="enjoyment">enjoyment</span> <span word="by">by</span> <span word="its">its</span> <span word="wearer">wearer</span>, <span word="then">then</span> <span word="a">a</span> <span word="branch">branch</span> <span word="of">of</span> <span word="the">the</span> <span word="facial">facial</span> <span word="nerve">nerve</span> <span word="also">also</span> <span word="activates">activates</span> <span word="little">little</span> <span word="muscles">muscles</span> <span word="around">around</span> <span word="the">the</span> <span word="eyes">eyes</span>, <span word="leading">leading</span> <span word="to">to</span> <span word="wrinkling">wrinkling</span> <span word="around">around</span> <span word="the">the</span> <span word="eyes">eyes</span> <span word="in">in</span> <span word="addition">addition</span> <span word="to">to</span> <span word="a">a</span> <span word="mouth">mouth</span> <span word="smile">smile</span>.</p><p>微笑肌附在口腔到颧骨上。当这个神经点燃时，肌肉被激活，我们的嘴角被拉起，然后我们就看起来是快乐的。如果它是一个真正的微笑，表示笑着的人真正的愉悦，那么面部神经的分支也会激活眼睛周围的小肌肉，导致眼睛周围的皱纹，除非它只是一个嘴角的微笑。</p>
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