Essential tremor is secondary to decreased dopaminergic neurotransmission in the basal ganglia.
Essential tremor is the most common adult-onset movement disorder and is characterized by an 8 to 12 Hz postural and kinetic tremor of the arms that may involve the head, voice, and legs. The pathophysiology of essential tremor is unknown. No pathologic findings are known to be consistently associated with essential tremor. Treatment of essential tremor includes primidone and ß-blockers,
such as propranolol. Parkinsons disease is caused by decreased dopaminergic neurotransmission in the basal ganglia.