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Independent of or contrary to the will. involuntary, adj performed independently of the will. involuntary. performed independently of the will. see culling. includes convulsions and tremor and intermittent contractions of large muscle masses which result in movement of individual limbs or other parts of the body.
A muscle may act ordinarily either under the control of the will or without conscious control. Muscles that can be controlled at will are referred to as voluntary muscles. Those that are not under the control of the will (volition) are called involuntary muscles. Examples of involuntary muscles are the smooth muscles, which are muscles lacking striations when viewed under a microscope. This is why involuntary muscles are sometimes called non-striated or un-striped muscles.