Which term describes a position that is internal or inward from the surface of the body?

The term that describes a position that is internal or inward from the surface of the body is "deep." In anatomical terminology, "deep" refers to structures that are located further away from the body’s surface. When comparing "deep" to "superficial," which refers to structures that are closer to the surface, it becomes clear that "deep" specifically indicates a position that is not just away from the surface, but rather beneath the superficial layers of the body.

"Distal" refers to a position that is further from the point of attachment of a limb to the body trunk, making it more relevant to limb anatomy rather than a general inward position. "Medial" pertains to a position closer to the midline of the body, which does not directly convey the idea of being internal. Thus, "deep" is the precise term to describe structures that are situated away from the outer layers, emphasizing their internal location within the body.