الفهرس 
Anatomical reviewOnly 14 pages are availabe for public view
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Abstract
Pain is a protective mechanism for the body, it occurs wherever any tissues are being damaged and it makes the individual to react against painful stimuli . Perception of pain as perception of other sensations is a neurophysiological process that has special structural, functional and perceptual properties and is accomplished by means of relatively simple neural, receptive and conductive mechanisms that are specific.for pain .Pain has been classified into two different types, acute pain and slow pain. Acute pain occurs within about 0.1 second when a painful stimulus is applied, whereas slow pain begins only after a se’cond or more and then, increases slowly over a period of seconds and even minutes. The conduction pathways for these two types of pain are different .