When neck pain strikes it can stop you in your tracks. You ask yourself, what is going on in there? Which muscle is being bothered? Why am I having this pain. Whether this pain is due to a muscle spasm, a pinched nerve or a misalignment  in the neck bones, it can be quite a pain in the neck !! Knowing the anatomy of your neck can be the first step in understanding your neck pain. 
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http://www.neckpainreliefkit.com/neckmuscles