Dysarthria is caused by a lesion of which of the following?
A. Broca's area, usually in the left hemisphere
B. Broca's area, usually in the right hemisphere
C. Wernicke's area, Broca's area, and the intervening cortical and subcortical structures
D. Lower motor neurons or corticobrainstem neurons
E. Neurons connecting Wernicke's area with Broca's area
ANS: D
Rationale: Damage to lower motor neurons (cranial nerves IX, X, and/or XII) causes paresis of speech muscles, producing flaccid dysarthria. Damage to corticobrainstem neurons that synapse with LMNs to speech muscles causes spastic dysarthria.
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