What does neurology focus on?

Neurology is the branch of medicine that specializes in the diagnosis and treatment of disorders involving the central and peripheral nervous systems. This includes a wide range of conditions such as epilepsy, stroke, multiple sclerosis, and neurodegenerative diseases like Alzheimer's and Parkinson's. The central nervous system comprises the brain and spinal cord, while the peripheral nervous system encompasses all other nervous tissue that connects the central nervous system to the body.

In contrast, the other options focus on different areas of medicine. The immune system pertains to immunology, addressing diseases and conditions related to immune response. Digestive health falls under gastroenterology, which deals with issues related to the gastrointestinal tract. Lastly, issues related to the muscular system are typically studied within orthopedics or rheumatology, focusing on musculoskeletal disorders. Thus, the correct answer aptly reflects neurology's specific focus on the nervous system.