The production of speech requires the contraction of the muscles of the lips, jaw, tongue, soft palate, larynx and pharynx that are involved in breathing.
Any damage to the nervous system causes disorganization at any level of the motor system involved in regulating the speech mechanism can lead to a disturbance in speech production (Papathanasiou. I, 2000).
Literally the term dysarthria comes from the Greek dys + joint which means “inability to express oneself clearly”. Dysarthria form a group of disorders characterized by impaired motor development of speech production. (Kampanarou. M, 2006)