What does the prefix 'sub-' indicate in terms of position?

The prefix 'sub-' is derived from Latin and translates to "under" or "beneath." In medical terminology, it is often used to describe structures or positions that are located below another part of the body or within a specific area. For instance, in terms like "subcutaneous," it refers to the layer of tissue under the skin. Recognizing this prefix is crucial for understanding various medical terms related to the anatomy and physiological context. The other options, while useful in their own right, do not accurately reflect the meaning of the prefix 'sub-,' which consistently denotes a lower position relative to something else.