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Motor speech disorders are a class of speech disorder that disturb the body's natural ability to speak. These disturbances vary in their etiology based on the integrity and integration of cognitive, neuromuscular, and musculoskeletal activities. Speaking is an act dependent on thought and timed execution of airflow and oral motor / oral placement of the lips, tongue, and jaw that can be disrupted by weakness in oral musculature (dysarthria) or an inability to execute the motor movements needed for specific speech sound production (apraxia). Such deficits can be related to pathology of the nervous system (central and /or peripheral systems involved in motor planning) that affect the timing of respiration, phonation, prosody, and articulation in isolation or in conjunction.
- Main article: Dysarthria
Dysarthria is the reduced ability to motor plan volitional movements needed for speech production as the result of weakness/paresis and/or paralysis of the musculature of the oral mechanism needed for respiration, phonation, resonance, articulation, and or prosody.
- Main article: Apraxia of speech
Apraxia is the inability to motor plan volitional movement for speech production in the absence of muscular weakness.
Symptoms and signs: Speech and voice / Symptoms involving head and neck (R47–R49, 784)
|Other speech disturbances||
Speech disorder · Apraxia of speech · Auditory verbal agnosia · Dysarthria · Schizophasia · Aprosodia/Dysprosody
Specific language impairment · Thought disorder · Pressure of speech · Derailment · Clanging · Circumstantiality
Developmental dyslexia/Alexia · Agnosia (Astereognosis, Prosopagnosia, Visual agnosia) ·Gerstmann syndrome ·
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