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Per reports out this afternoon, Rangers reliever Mike Adams, who had an uncharacteristically poor outing last night, is "dealing with a tight right Trapezius muscle."
Wikipedia defines the Trapezius muscle thusly:
In human anatomy, the trapezius is a large superficial muscle that extends longitudinally from the occipital bone to the lower thoracic vertebrae and laterally to the spine of the scapula (shoulder blade). Its functions are to move the scapulae and support the arm.
They have diagrams so you can see where it is.
Adams, a key part of the Rangers' bullpen and one of their top relievers, is expected to only be sidelined a couple of days. Keeping Adams healthy and effective will be critical for the Rangers' postseason plans, as he is expected to be the team's primary 8th inning reliever.