Once upon a time, I felt an ant crawling on my hand. I couldn't feel it initially, until it reached my wrist. Then I tried to let the ant crawl on my skin; what I found was that I couldn't feel the ant when it crawled on my finger tips, but could start to feel it when it reached the back of my hand.
It reached maximum sensation when it reached the back of my wrist. I could completely feel the difference, even when closing my eye.
Thus, is the wrist denser in neurons than the finger tips?
If this is true, since I know there is a type of torture that use needle to pin the victim's finger tip to cause serious pain, but if finger tips are less sensitive than the wist, shouldn't this torture should pin on the wrist to even cause more pain.
I have searched for the neuron density on our hand, but can't find a satisfactory answer, maybe I just search the wrong words.