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Fasciculation: Involuntary contractions or twitching of groups of muscle fibers.

Fibrillation: Rapid contractions or twitching of muscular fibrils but not of the entire muscle.

Field of view: The portion of the viewing area that can be perceived by an individual without turning his or her head and irrespective of acuity.

Flaccid: Relaxed or without tone.

Graphesthesia: Tactual ability to recognize writing on the skin.

Hemianopsia: Partial blindness in the visual fields of one or both eyes