The central nervous system preserved in alcohol, that is contained in this methacrylate cylinder, controls all processes in our body. Above is the encephalon, the part that is enclosed in the skull. From it comes a long cord about 45 cm in length, called the spinal cord, which is lodged in the spine and carries the nerve impulses to the rest of the body. The brain and spinal cord are surrounded by meninges, membranes that hold a clear liquid, cerebrospinal fluid, which acts as a shock absorber of the brain protecting it from blows and bruises. In the middle of the brain it has been removed the meninges so that you better see the anatomy of the cerebral cortex.