Which prefix would you use to indicate something located below another structure?

• A. Infra-
• B. Endo-
• C. Caud/o
• D. Amyl/o

Answer: (A)

Position in anatomy uses prefixes to describe where something is relative to another structure. The prefix that means below or beneath is infra-. It appears in terms like infraclavicular (below the clavicle) or infrapatellar (below the patella), making it the best fit for indicating a lower position.

Endo- means within or inside, which doesn’t convey a below relationship. Caud/o refers to the tail or tailward direction (toward the lower end of the body), which is a directional sense rather than a general “below” relationship. Amyl/o means starch, not location.