Topic - Twitch

== Physiology ==* Muscle contraction and relaxation** Convulsion, rapid and repeated muscle contraction and relaxation, resulting in uncontrolled shaking** Fasciculation, a small, local, involuntary muscle contraction** Myoclonic twitch, a jerk usually caused by sudden muscle contractions** Myokymia, a continuous, involuntary muscle twitch that affects the muscles of the face, particularly the eyelids** Spasm, a sudden, involuntary contraction of a muscle, group of muscles, hollow organ, or orifice** Tic, an involuntary, repetitive, nonrhythmic movement or vocalization of sudden onset and involving discrete muscle groups** Tremor, an involuntary, repetitive, somewhat rhythmic, muscle contraction and relaxation - Source: Wikipedia