Except the fact that they are all human facial expressions they all controlled by a muscle group called platysma muscles. These muscles extend from your lower jaw, to your neck, throat and down to your chest. These are the muscles around your neck that swell up after intense workouts or when you run too much. Also, the muscle group that gets tensed up, when you tilt your neck sideways, while shaving for example, is the platysma muscle group.
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