brain

that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason

mental ability

“he's got plenty of brains but no common sense”

someone who has exceptional intellectual ability and originality

that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord

hit on the head

kill by smashing someone's skull

the brain of certain animals used as meat