Correct Answer: D
Explanation:
Each cerebral hemisphere is divided into four lobes: the frontal, parietal, occipital and temporal lobes. Each spinal segment gives rise to four spinal roots (two dorsal and two ventral roots) but the dorsal and ventral roots fuse to form the spinal nerves. Therefore each segment gives rise to a pair of spinal nerves. In the cerebral hemispheres the grey matter lies on the outside with the white matter beneath. In the spinal cord the grey matter forms the central butterfly shaped region and is surrounded by white matter.