The cerebral cortex is the outer layer of which brain structure?

• A. Inner layer of the cerebrum
• B. Structure within the brainstem
• C. Nerve tissue inside the spinal cord
• D. Outer layer of the cerebrum

Answer: (D)

The cerebral cortex is the outer layer of the cerebrum. It’s the sheet of gray matter on the brain’s surface where neuron cell bodies reside, and it handles many higher-order functions like perception, thought, and voluntary movement. The inside of the cerebrum is mostly white matter, with myelinated fibers beneath the cortex. Structures like the brainstem and spinal cord are different parts of the nervous system, not the outer cortical layer. So describing the cortex as the outer layer of the cerebrum precisely matches its anatomical position and organization.