In anatomical terms, what does the apex refer to?

• A. The base of the organ
• B. A hollow cavity
• C. The highest point
• D. The side edge

Answer: (C)

In anatomy, the apex is the tip or pointed end of an organ—the part farthest from its base. The base is the broader end where the organ attaches or is oriented toward the body, so the apex describes that farthest, pointed portion. This distinguishes it from a hollow cavity (which is a lumen within an organ) or a side edge (the margin or border). Thinking of the apex as the highest, pointed point helps you visualize how organs are described in terms of their extremities, with the base opposite it.