Which region of the brain controls voluntary muscle movement?

• A. Motor cortex
• B. Sensory cortex
• C. Cerebellum
• D. Brainstem

Answer: (A)

Voluntary muscle movement is initiated and controlled by the motor cortex, a region in the frontal lobe known as the precentral gyrus. Neurons here plan and send the commands that start contractions in skeletal muscles, traveling down the spinal cord via the corticospinal tracts to reach motor neurons and muscles. This area even has a map of the body—the motor homunculus—so different body parts have dedicated representations, helping explain why certain areas are more involved in precise movements. When the motor cortex sends signals, it sets the sequence and force of movement. The sensory cortex, in contrast, processes touch, temperature, and other sensations; it doesn’t generate movement. The cerebellum fine-tunes and coordinates movements to keep them smooth and balanced, but it relies on input from the motor cortex to function. The brainstem handles basic life-support tasks and acts as a relay center, not the origin of voluntary motor commands.