Your brain weighs about three pounds. Sixty percent of the dry weight is fat, making the brain the fattiest organ in the body.
In humans, the brain is the command center of the nervous system. It receives input from the sensory organs and sends output to the muscles. It is located inside the skull of the head and is protected by a bony structure in the skull called the cranium. The three membranes called meninges surround the brain and protect it. The space between the meninges is filled with a cerebrospinal fluid which helps the brain from mechanical shocks. Cranial nerves arise from the brain.
It is divided into three parts, forebrain, midbrain, and hindbrain. The forebrain consists mainly of the cerebrum, which is the main thinking part of the brain. Midbrain doesn't have any further division and the hindbrain consists of pons, cerebellum, and medulla. The function of the hindbrain is to control reflex movements of the head, neck, and trunk in response to visual and auditory stimuli. It also controls the reflex movements of the eye muscles.