This document is a PowerPoint presentation on the regions of the brain and protection of the central nervous system. It begins by describing the major regions of the brain - cerebral hemispheres, diencephalon, brain stem, and cerebellum. It then focuses on the cerebral hemispheres, describing lobes, specialized areas, and layers. Next, it discusses the diencephalon, brain stem, and cerebellum. It concludes by covering protection mechanisms like meninges, cerebrospinal fluid, and the blood-brain barrier.