Category B - full version without watermark 720x576 (check terms and conditions at www.teledesign.de) The embed version with watermark is free of charge. - Description: Injuries and pain are detected by nociceptors. These are free nerve endings in the skin. They release an electrical impulse that is instantaneously forwarded to the brain through a special neural circuit -- the sensory nerves. Within the brain the arriving pain signals are evaluated, rated, localized and a decision is made on the appropriate reaction. For all skin areas there are respective areas in the so called sensory homunculus. The decision to "pull back the hand" or to "eliminate the cause" is transmitted to the "scene of action" at lightning speed via the motor neurons. And it is there that the reaction to the pain stimulus will be carried out.