What is the function of the round window in the cochlea?

What is the function of the round window in the cochlea?

• A. Absorbs the wave's energy and dissipates it.
• B. Transmits energy to the middle ear without damping.
• C. Converts mechanical energy directly into neural impulses.
• D. Amplifies pressure changes within the cochlea.

Answer: (A)

The round window serves as a flexible boundary that relieves pressure inside the fluid-filled cochlea. When the stapes pushes on the oval window, the cochlear fluids are nearly incompressible, so this pressure would build up unless there’s a way for displacement to occur. The round window moves in the opposite phase to the oval window, bulging outward as the oval window bulges inward. This movement allows the cochlear fluids to displacement and the traveling waves to propagate along the cochlea, while energy is dissipated through the motion of the membrane and surrounding fluids. So, its role is to relieve pressure and dissipate energy, enabling the basilar membrane to vibrate and the hair cells to transduce mechanical energy into neural signals. It does not transmit energy to the middle ear, nor convert mechanical energy directly into neural impulses (that’s done by hair cells), and it does not amplify pressure changes.

The round window serves as a flexible boundary that relieves pressure inside the fluid-filled cochlea. When the stapes pushes on the oval window, the cochlear fluids are nearly incompressible, so this pressure would build up unless there’s a way for displacement to occur. The round window moves in the opposite phase to the oval window, bulging outward as the oval window bulges inward. This movement allows the cochlear fluids to displacement and the traveling waves to propagate along the cochlea, while energy is dissipated through the motion of the membrane and surrounding fluids.

So, its role is to relieve pressure and dissipate energy, enabling the basilar membrane to vibrate and the hair cells to transduce mechanical energy into neural signals. It does not transmit energy to the middle ear, nor convert mechanical energy directly into neural impulses (that’s done by hair cells), and it does not amplify pressure changes.