Muscle twitching is also called muscle fasciculation. Twitching involves small muscle contractions in the body. Your muscles are made up of fibers that your nerves control. Stimulation or damage to a nerve may cause your muscle fibers to twitch.

Why do muscle Fasciculations occur?

Fasciculations arise as a result of spontaneous depolarization of a lower motor neuron leading to the synchronous contraction of all the skeletal muscle fibers within a single motor unit. An example of normal spontaneous depolarization is the constant contractions of cardiac muscle, causing the heart to beat.

Are muscle Fasciculations normal?

A fasciculation is commonly known as a muscle twitch. Muscle twitches are normal, and the majority of people will experience one at some point. Typical examples include an eyelid twitch or a leg spasm.