What do you know about the central nervous system? The brain is enclosed in the skull and is protected by the cranium. The spinal cord is unbroken with the brain, and it lies caudally to the brain. There are many CNS diseases and conditions such as ADHD and autism, late-onset neurodegenerative disorders such as Alzheimer’s, Parkinson’s, autoimmune and inflammatory diseases, multiple sclerosis, and genetic disorders such as Huntington’s disease. This fascinating quiz will be useful to you.