Spastic Dysarthria is caused by damage to which part of the nervous system?

• A. Basal ganglia
• B. Pyramidal and extrapyramidal system
• C. Cerebellum
• D. Peripheral nerves

Answer: (B)

Spastic dysarthria results from damage to the pyramidal and extrapyramidal systems, which are critical components of the nervous system involved in motor control. The pyramidal system primarily controls voluntary movements, while the extrapyramidal system manages involuntary movements and reflexes.

When damage occurs in these areas, it leads to increased muscle tone and reduced control over the movement of speech muscles, creating the hallmarks of spastic dysarthria, such as a strained or harsh voice quality and articulation difficulties. This dysfunction manifests as muscle stiffness and weakness, affecting the clarity and rhythm of speech.

The other options represent different parts of the nervous system and are associated with other types of motor speech disorders. For instance, while basal ganglia damage is linked to dysarthrias characterized by reduced movement (like hypokinetic dysarthria), the cerebellum is primarily involved in coordinating and regulating balance and fine motor movements, typically associated with ataxic dysarthria. Peripheral nerve damage may lead to flaccid dysarthria due to weakness or paralysis of speech muscles but is not linked to the spastic characteristics seen in this condition.