The dorsal surface is the area located on the upper or back portion of an animal or object. There are several synonyms for the term "dorsal surface," including the back, upper surface, top, spine, and posterior region. Understanding the synonyms for this term can be useful when describing a particular anatomical feature or when discussing the morphology of an animal. The dorsal surface of animals such as fish, reptiles, and mammals is an important feature that provides important information about their physiology, behavior, and habitat. As such, it is crucial to use the correct terminology when referring to this anatomical structure.