January 12, 2020
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【輕輕鬆鬆一分鐘⋯⋯動手指】
#看似簡單的動作原來不簡單
#找朋友印證一下吧
#星期日輕輕鬆鬆一分鐘
發誓手勢大家都會做吧，就是食指、中指跟無名指豎起，拇指及尾指屈曲，現在就做做看，看看你的手勢，一般都是拇指按著尾指的，試試將尾指按著拇指吧，咦？為甚麼無名指會跟著屈曲起來？尾指越用力，無名指彎曲得越厲害，輕輕轉換手指，發誓手勢已經變得怪怪的！據說尾指按著拇指還能如常做到發誓手勢的人很少，你知道為甚麼嗎？
答案：
手指動作需要動用手指上的屈肌腱，無名指沒有獨立的肌腱，驅動無名指和尾指的肌腱有分叉連接著，所以當彎曲尾指時，無名指就會被牽動，無法完全伸直。
Relax for a minute- Move your fingers
Everyone knows how to swear with the index finger, middle finger and ring finger standing up and flexing the thumb and pinky. Let’s try to do it now. You can see you generally would press the pinky with your thumb. Try to press your thumb with your pinky now. Why does the ring finger bend at the same time? The harder your pinky presses, the more your ring finger bends. Switching finger position will make the gesture weird! Only very few people can do the swear gesture with their thumb on their pinky.
Answer:
You need the flexor tendon on the finger to finish the finger movement. The ring finger has no independent tendon and the tendon that drives the ring finger and the pinky is bifurcated. Therefore, when the pinky is bent, the ring finger will be pulled and cannot fully straighten.
