The inability to perform rapidly alternating movements (dysdiadochokinesia) is associated with lesions of the

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[III F $1 \mathrm{c}, 3 \mathrm{c}$ ]. Coordination of movement (synergy) is the function of the cerebellum. Lesions of the cerebellum cause ataxia, lack of coordination, poor execution of movement, delay in initiation of movement, and inability to perform rapidly alternating movements. The premotor and motor cortices plan and execute movements. Lesions of the substantia nigra, a component of the basal ganglia, result in tremors, lead-pipe rigidity, and poor muscle tone (Parkinson disease).

The Inability to Perform Rapidly Alternating Movements (Dysdiadochokinesia) Is Associated