PhD Tremor is a somewhat regular, rhythmic oscillation of part of the body. Its rhythmic quality helps distinguish it from other forms of involuntary movements such as chorea, ballismus, tics, dystonia, and myoclonus.
Myoclonus produces a lightning-like muscle jerk that is considerably more abrupt than a tremor.
If the myoclonus is rhythmic, it can usually be distinguished from tremor by its appearance on electromyographic testing. Although tremor usually involves the hands, it may occur in the tongue, jaw, facial muscles, or feet. Several behavioral criteria are useful in the classification and treatment of tremor. An action tremor occurs during motion or muscular exertion. A postural tremor occurs in a limb during a maintained posture against gravity.