Where does the stapes transmit vibrations from the middle ear?

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Cross-section diagram of the human ear showing the outer ear, middle ear, and inner ear, with labeled parts including the auricle, auditory canal, tympanic membrane, ossicles, cochlea, semicircular canals, and nerves. — human ear Structure of the human ear.

The stapes transmits vibrations from the middle ear to the inner ear by rocking back and forth against the oval window. The footplate of the stapes fits into this opening in the bony otic capsule, where it acts to deliver sound waves into the perilymph of the vestibule and the scala vestibuli.123