What does the abbreviation "sub" suggest about the position in medical terms?

The abbreviation "sub" in medical terminology indicates a position that is below or under something. This prefix is derived from Latin, where "sub" translates to "under" or "beneath." For instance, terms like "subcutaneous" refer to something that is located under the skin, and "subdural" refers to an area beneath the dura mater, one of the protective membranes surrounding the brain and spinal cord. Understanding this prefix is crucial in medical practice, as it helps clarify anatomical relationships and the locations of various structures and conditions in the body.