Which term indicates the position that is related to the middle of the body?

The term that indicates the position related to the middle of the body is "medial." In anatomical terminology, "medial" refers to structures that are closer to the midline of the body, which is the imaginary vertical line that divides the body into equal left and right halves. This term is commonly used in anatomy to describe the location of various body parts in relation to one another. For example, the nose is medial to the cheeks, meaning the nose is situated closer to the center of the face than the cheeks are.

In contrast, the other terms do not denote a middle position. Being "pertaining to the back" refers to the dorsal aspect of the body, which is not centered. "Pertaining to the outer part" indicates a position that is further away from the midline, often described as lateral. "Inferior" relates to a position that is lower on the body in comparison to another part, again indicating a vertical relationship rather than a medial one. Therefore, "medial" is the appropriate choice for describing something positioned in relation to the middle of the body.