Encyclopedia of Pain

2007 Edition


Reference work entry
DOI: https://doi.org/10.1007/978-3-540-29805-2_167


The sympathetic nervous system is an involuntary system that plays an important role in normal physiological functions, such as control of body temperature and regulation of blood flow to various tissues in the body. These nerves release a chemical called norepinephrine that activates specific receptors, called adrenergic receptors or adrenoceptors. There are two main subtypes of adrenoceptors – one of which is the alpha adrenoceptors.

 Sympathetically Maintained Pain in CRPS II, Human Experimentation

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© Springer-Verlag Berlin Heidelberg 2007