This article states that some people will have 3 on one side and 4 on the other.These muscles occupy a very crowded place,the carotid artery,jugular vein,intermediate tendon of the omohyoid muscle,phrenic nerve,,and the transverse cervical and scapular arteries all lie between the anterior scalene and the sternocleidomastoid muscle,it makes sense to beef this up and stretch them.They also assist with breathing.The article discusses a stretching method,I like to use a universal machine for stretching,standing between the handlse of a benching station with the bench pulled out of course,I lower the shoulders under tension and then move my head laterally away from one side and then the other.I transfer most of the load to the slightly lowered shoulder,moving the head in the opposite direction.EDIT You will have to scroll down to Scalenes
http://www.gustrength.com/muscles:sc...trigger-points


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