A medical doctor who is specialized in operating on the heart, lungs, and important blood vessels: A cardiovascular surgeon is an expert in repairing blocked arteries, bypass, defective heart valves, and congenital disorders.

A physician who specializes in the medical problems of the jaws and the mouths: Oral surgeons usually extract teeth, while the maxillofacial surgeons often treat patients with facial problems that are associated with the upper and lower jaw structures.

A physician who specializes in the corrective treatments of musculo-skeletal deformities, diseases, and ailments; an orthopedist: An orthopedic surgeon is an expert in the disorders of the spine and joints and the correction of deformities of these areas.

The fracture of Jim's leg was repaired by an orthopedic surgeon at the hospital.