Describe the structural components of the central nervous system, ensuring to detail the nerve.Question 3 (~150 words)Describe how myelin contributes to the normal functioning of the CNSQuestion 4 (~10 words)What nerve is likely compromised and contributing to the patients vision impairment?Page 1 of 2

Question 1: The central nervous system (CNS) is composed of two main structural components: the brain and the spinal cord. The brain is the control center of the body, responsible for processing sensory information and controlling motor functions. It is divided into several regions, including the cerebrum, cerebellum, and brainstem, each with specific functions. The spinal cord, on the other hand, is a long, thin bundle of nervous tissue that extends from the brainstem to the lower back. It serves as a conduit for signals between the brain and the rest of the body. Nerves are bundles of fibers that transmit these signals. They are composed of neurons, which are specialized cells that can generate and transmit electrical impulses.

Question 2: Myelin is a fatty substance that wraps around the axons of many neurons in the CNS. It serves several crucial functions. Firstly, it insulates the axons, preventing electrical signals from leaking out. This allows the signals to travel more efficiently along the neuron. Secondly, it speeds up the transmission of these signals. This is because the electrical impulses can jump from one node of Ranvier (gaps in the myelin sheath) to the next, a process known as saltatory conduction. Without myelin, these signals would travel much more slowly, impairing the normal functioning of the CNS.

Question 3: The optic nerve, which transmits visual information from the retina to the brain, is likely compromised and contributing to the patient's vision impairment.