Parkinson disease antipsychotics are associated with motor effects linked to which brain region?

Parkinson disease antipsychotics are associated with motor effects linked to which brain region?

• A. Basal Ganglia
• B. Frontal Lobe
• C. Hippocampus
• D. Cerebellum

Answer: (A)

Parkinson-like motor effects from antipsychotics come from blocking dopamine in the nigrostriatal pathway, which sends dopamine from the substantia nigra to the basal ganglia. The basal ganglia regulate movement, and when D2 receptors in this system are antagonized, dopamine signaling drops, leading to slowed, rigid, and tremor-producing motor symptoms reminiscent of Parkinson disease. The frontal lobe is involved in planning and behavior, the hippocampus in memory, and the cerebellum coordinates movement but is not the site where antipsychotic-induced parkinsonism primarily arises. Thus, the motor effects are linked to the basal ganglia.

Parkinson-like motor effects from antipsychotics come from blocking dopamine in the nigrostriatal pathway, which sends dopamine from the substantia nigra to the basal ganglia. The basal ganglia regulate movement, and when D2 receptors in this system are antagonized, dopamine signaling drops, leading to slowed, rigid, and tremor-producing motor symptoms reminiscent of Parkinson disease. The frontal lobe is involved in planning and behavior, the hippocampus in memory, and the cerebellum coordinates movement but is not the site where antipsychotic-induced parkinsonism primarily arises. Thus, the motor effects are linked to the basal ganglia.