Neck muscles are called scalenes and SCM , -
https://www.google.com/search?client...FYaZiALP7IDgDA
those of us with TOS have a lot of trouble with those pesky muscles -
w/ spasms & triggerpoints..
As well as the rhomboids , traps and other upper back & shoulder muscles.
http://neurotalk.psychcentral.com/thread125577.html