- 1TIGHTrear neck and side necklevator scapulaescalenessternocleidomastoidupper trapeziusshoulder internal rotatorssubscapularisteres majoranterior deltoids
- 2WEAKupper-arm external rotatorsinfraspinatusposterior deltoidsteres minor
- 4WEAKdeep-neck flexorslongus capitislongus colli
- 3TIGHT chest musclespectoralis majorpectoralis minor
Overactive or tight muscles and underactive or weak muscles can include a tight rear neck and side neck, weak upper-arm external rotators, tight chest muscles, and weak deep-neck flexors.
Tight shoulder, rear-neck, and chest muscles cross with weak deep-neck flexors and midback muscles
Neck strain and rotator cuff syndrome or rotator cuff tears
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