Touch – Josephine Lam, Jane Kim, Reed

Your sense of touch is found all over your body because it originates in the bottom layer of your skin known as the dermis. The dermis is made up of many tiny nerve endings that carry information about things to come into contact with your body to the spinal cord, which signifies the brain where the feeling is registered.

The nerve receptors detects temperature, pain, pressure or touch and sends the message to your brain. Without it, you would not be able to tell if something hurts!

Some parts of your body (such as the tongue), are more sensitive than others because they have more nerve endings. The sides of your tongue is very sensitive to pain but not so much hot or cold, which is why it is easy to burn your mouth when you eat something very hot. Fingertips are also very sensitive; blind people use it to read Braille. There are about 100 touch receptors in each of your fingertips. Other sensitive areas of your body include lips, face, neck, feet and hands. The least sensitive part of your body is the middle of your back.

http://en.wikipedia.org/wiki/Sense

http://library.thinkquest.org/3750/touch/touch.html



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