Which structure is responsible for converting acoustic energy into mechanical vibrations within the middle ear?

Which structure is responsible for converting acoustic energy into mechanical vibrations within the middle ear?

• A. Eardrum
• B. Pinna
• C. Oval Window
• D. Round Window

Answer: (A)

Sound waves traveling through the ear canal cause the tympanic membrane to vibrate in response to changing air pressure. That vibration is the first step in turning acoustic energy into mechanical energy, which then drives the hammer, anvil, and stirrup (the ossicles) to convey the motion to the oval window and into the inner ear. The tympanic membrane is therefore where acoustic energy becomes mechanical vibrations in the middle ear. The pinna mainly collects and shapes sound, the oval window passes the vibrations into the inner ear, and the round window helps equalize pressure but does not convert energy itself.

Sound waves traveling through the ear canal cause the tympanic membrane to vibrate in response to changing air pressure. That vibration is the first step in turning acoustic energy into mechanical energy, which then drives the hammer, anvil, and stirrup (the ossicles) to convey the motion to the oval window and into the inner ear. The tympanic membrane is therefore where acoustic energy becomes mechanical vibrations in the middle ear. The pinna mainly collects and shapes sound, the oval window passes the vibrations into the inner ear, and the round window helps equalize pressure but does not convert energy itself.