Concept:The brain is covered by three protective membranes called the meninges.Explanation:The outermost of these membranes is the dura mater.It is a tough, fibrous layer that lies closest to the skull.The middle membrane is the arachnoid mater.The innermost membrane, which touches the brain surface, is the pia mater.The myelin sheath is not a brain covering; it insulates nerve fibres.Answer:B. Dura mater