Prepare for the ACVREP Orientation and Mobility (OandM) Exam. Use our study aids and multiple-choice questions, each with detailed explanations. Boost your confidence and succeed!

Multiple Choice

What are the three middle ear bones commonly known as?

The three auditory ossicles form a tiny lever system that carries sound from the eardrum into the inner ear. These bones are the hammer (malleus), anvil (incus), and stirrup (stapes). The malleus is attached to the eardrum, the incus sits between the two, and the stapes presses against the oval window of the cochlea. This chain amplifies and transfers vibrations efficiently despite the shift from air to fluid in the inner ear, helping to boost the force of the sound waves as they enter the inner ear. Other structures listed aren’t the middle ear bones: the cochlear duct is part of the inner ear’s cochlea, the Eustachian tube helps ventilate the middle ear, and the semicircular canals are involved in balance. So hammer, anvil, and stirrup are the three bones in question.

The three auditory ossicles form a tiny lever system that carries sound from the eardrum into the inner ear. These bones are the hammer (malleus), anvil (incus), and stirrup (stapes). The malleus is attached to the eardrum, the incus sits between the two, and the stapes presses against the oval window of the cochlea. This chain amplifies and transfers vibrations efficiently despite the shift from air to fluid in the inner ear, helping to boost the force of the sound waves as they enter the inner ear.

Other structures listed aren’t the middle ear bones: the cochlear duct is part of the inner ear’s cochlea, the Eustachian tube helps ventilate the middle ear, and the semicircular canals are involved in balance. So hammer, anvil, and stirrup are the three bones in question.