What does the prefix "ab-" typically indicate?

The prefix "ab-" typically indicates a direction away from something. In medical terminology, this can refer to moving away from a particular structure or function in the body. For example, "abduction" describes the action of moving a limb away from the midline of the body. The prefix stems from the Latin word "ab," meaning "from" or "away." Understanding this prefix is essential in medical contexts, as it helps clarify the spatial relationships between different body parts and their movements.

The other options represent different prefixes: "toward," which is associated with "ad-"; "with," often indicated by "co-" or "con-"; and "against," which could be described by "contra-" or "anti-." Recognizing these distinctions allows health professionals to communicate precisely about anatomy and physiological actions.