What two motor centres are imbedded within the midbrain?

• A. Substantia nigra and the red nucleus
• B. Subthalamic nucleus and caudate
• C. Putamen and globus pallidus
• D. Dentate nucleus and inferior olive

Answer: (A)

Two motor centers housed in the midbrain are the substantia nigra and the red nucleus. The substantia nigra is a midbrain structure that’s part of the basal ganglia circuitry and provides dopaminergic input to the striatum, shaping the initiation and smooth execution of movement. The red nucleus lies in the midbrain and receives cerebellar input, contributing to motor coordination of the limbs via the rubrospinal tract. The other structures belong to different brain regions: the subthalamic nucleus is in the diencephalon, the caudate and the putamen/globus pallidus are in the telencephalon, and the dentate nucleus is in the cerebellum while the inferior olive is in the brainstem.