Topographic anatomy, also known as regional anatomy, refers to the study of body structures and their relationships to each other. Some synonyms for topographic anatomy include systemic anatomy, gross anatomy, and macroscopic anatomy. Systemic anatomy focuses on the study of the major organ systems of the body, while gross anatomy refers to the study of large, visible structures. Macroscopic anatomy deals with the structures that can be seen with the naked eye. Other related terms include surface anatomy, which deals with the superficial structures of the body, and comparative anatomy, which involves the study of similarities and differences between different species.