With free nerve endings as receptors, pain carries information to the brain about a real or potential injury to the body. Pain from the skin is transmitted through two types of nerve fibers. A-delta fibers relay sharp, pricking types of pain, while C fibers carry dull aches and burning sensations. Pain impulses are relayed to the spinal cord, where they interact with special neurons that transmit signals to the thalamus and other areas of the brain. Each neuron responds to a number of different pain stimuli. Pain is carried by many types of neurotransmitters, a fact that has made it possible to develop numerous types of pain-relieving medications. Many factors affect how pain is experienced. Pain thresholds vary with the individual and the occasion. Intensely concentrated activity may diminish or even eliminate the perception of pain for the duration of the activity. Natural mechanisms, including replacement by input from other senses, can block pain sensations. The brain can also block pain by signals sent through the spinal cord, a process that involves the neurotransmitter serotonin and natural painkillers known as endorphins.
Read more: Touch - Pain, Skin, Receptors, and Temperature - JRank Articles http://psychology.jrank.org/pages/634/Touch.html#ixzz4HmROnyxx
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