What term describes a position that is closer to the center of the body?

The term that describes a position closer to the center of the body is "deep." In anatomical terminology, "deep" refers to structures that are located further away from the surface of the body and closer to the interior or central structures. This term is commonly used in medical contexts to distinguish between surfaces of the body; for instance, the bones are considered deep to the skin.

In contrast, "superficial" refers to something that is closer to the surface of the body. "Inferior" describes a position that is lower than another structure, while "prone" indicates a body position where an individual is lying face down. Therefore, in the context of anatomy, "deep" is the term that accurately represents proximity to the central aspects of the body.