Which disorder affects speech production by impairing the control of speech muscles?

Dysarthria is a motor speech disorder caused by neurological injury that impair the control of the muscles used for speech. This condition can arise from a variety of causes, including brain injury, stroke, or conditions like Parkinson's disease. Individuals with dysarthria often have slurred or slow speech, making it difficult for them to articulate words clearly.

The characteristics of dysarthria stem from weakness, paralysis, or lack of coordination in the speech muscles, which include the lips, tongue, vocal cords, and respiratory system. This impairment disrupts the normal flow and clarity of speech, making it challenging for the affected individuals to communicate effectively.

In contrast, apraxia of speech is a disorder related to difficulty planning and coordinating the movements necessary for speech, rather than muscle control itself. Multiple sclerosis is a neurological disease that can lead to a variety of symptoms, including issues with speech, but it is not classified specifically as a speech disorder. Lastly, audio-spinal facilitation does not refer to a recognized condition affecting speech production, further indicating that dysarthria is the correct response.