What prefix is used to indicate "upon" or "over" in medical terminology?

The prefix "epi-" is derived from Greek, meaning "upon" or "over." In medical terminology, it is commonly used to denote something that is situated on top of, or above, another structure. For example, the term "epidermis" refers to the outermost layer of the skin, literally meaning "upon the skin."

This prefix is frequently found in various medical terms to indicate location or position relative to something else. For example, "epigastric" refers to the area above the stomach, aligning with the meaning of the prefix.

The other prefixes provided have different meanings: "neo-" refers to new, "pre-" signifies before, and "append-" relates to an attachment or something that is added, which does not convey the idea of position above or on top of another structure.