Question

wrinkled, outer layer of gray matter that covers the cerebral hemispheres
myelin sheath
cerebrum
basal ganglia
pons
cerebral cortex

Explanation:

The cerebral cortex is the wrinkled, outer - layer of gray matter covering the cerebral hemispheres. The myelin sheath insulates nerve fibers, the cerebrum is the large upper part of the brain but not specifically the outer gray - matter layer, basal ganglia are a group of nuclei deep within the brain, and the pons is part of the brainstem.

Answer:

cerebral cortex