The document summarizes key aspects of anatomy and physiology in 3 pages. [1] It describes the layers of the meninges - dura mater, arachnoid membrane, and pia mater - which cover and protect the brain and spinal cord. It also discusses the cerebrospinal fluid found in the subarachnoid space surrounding the brain and spinal cord. [2] The second page discusses the peripheral nervous system, including the autonomic nervous system which functions independently. The autonomic nervous system is divided into the sympathetic and parasympathetic nervous systems which work in opposition to prepare the body for activity or rest. [3] The remaining pages were written by different