The brain is an organ of the nervous system that consists of a mass of nerve tissues that controls and regulates bodily activities. It is also the primary organ of the CNS contained within the skull that receives and interprets countless signals, The brain is made up of approximately 100 billion nerve cells.An adult human brain is approximately 1.3 kilograms or 2.8u pounds mass of pinkish gray.It is divided into three parts:the cerebrum.cerebellum, and the brain stem.:)
