A small cavity surrounding the bones of the middle ear; fluid can accumulate and may need to be drained by puncturing which structure?

• A. Temporal Bone
• B. Cochlea
• C. Tympanic Cavity
• D. Vestibule

Answer: (C)

The middle ear contains a small air-filled space called the tympanic cavity, which surrounds the auditory bones. When fluid accumulates in this space (otitis media with effusion), relief is achieved by puncturing the tympanic membrane to vent the tympanic cavity and drain the fluid into the ear canal. This procedure, often followed by placement of a tympanostomy tube, directly addresses the collection of fluid in the middle ear. The other options are either bone or inner-ear structures that aren’t the sites drained in this process.