A specialist in myology studies which of the following?

A specialist in myology focuses specifically on the study of muscles. Myology, derived from the Greek words "mys," meaning muscle, and "ology," meaning the study of, encompasses various aspects of muscle structure, function, and pathology. This field is concerned with how muscles contract, their roles in movement, and any diseases or conditions that may affect them.

The other fields mentioned, such as joints, nerves, and bones, pertain to different specialties within anatomy and physiology. For example, specialists who focus on joints would be in the field of arthrology, those who study nerves are involved in neurology, and the study of bones falls under osteology. Each of these areas requires distinct expertise and knowledge separate from myology.