What is the term for a passage or opening in anatomy?

The term "meatus" refers specifically to a passage or opening in anatomy, particularly within the context of the body’s systems. This term is often used in reference to a canal or duct that serves as a pathway for fluids or other substances. For example, the external acoustic meatus is the term for the ear canal.

In contrast, a foramen typically describes an opening in a bone that allows blood vessels and nerves to pass through, a cavity refers to a hollow space within the body, such as the chest or abdominal cavity, and a fissure refers to a narrow groove or slit-like opening. Each of these terms represents different anatomical structures or functions, but a meatus specifically emphasizes the idea of a passageway.