Question

vibration of the ____________ is directly transmitted to the oval window and causes waves of perilymph in the upper scala. multiple choice malleus spiral organ incus tympanic membrane stapes

Explanation:

The stapes is the last of the three ossicles in the middle ear. Its footplate covers the oval window. When the stapes vibrates, it directly transmits these vibrations to the oval window. This action then causes waves of perilymph (the fluid in the scala vestibuli - upper scala of the cochlea). The malleus and incus are other ossicles but do not directly transmit vibrations to the oval window. The tympanic membrane (eardrum) is involved in the initial sound - wave reception but not the direct transmission to the oval window. The spiral organ (organ of Corti) is involved in sound transduction (converting mechanical vibrations to neural signals) rather than transmitting vibrations to the oval window.

Answer:

stapes