There isn't a specific Doctor Who specializes in this field of medicine. It will usually depend on what kind of musculoskeletal symptoms you are experiencing. Doctors who are D.O rather than M.D. have special training in the musculoskeletal system as well.
neurologists
A doctor who specializes in sleep and sleep disorders
Osteopathologist or osteopathic physician. A doctor who specializes in orthopedic medicine treats the human musculoskeletal system including the spine. However, other specialists treat spinal disorders. See related link.
A doctor who specializes in threating kidney deceases and disorders
A neurologist, specifically a neurologist that specializes in movement disorders.
A doctor who has specialised in blood called a Hematologist.
No, a pumanologist is an MD who specializes in disorders of the lungs.
They are a doctor that specializes in treating and diagnosing disorders of the endocrine system.
A proctologist is a doctor who specializes anal, rectal, and intestinal disorders.
A physician who specializes in diseases of the skin.
A podiatrist is a foot doctor.
A psychiatrist is a physician of the mind.