Which set of bones forms the auditory ossicles in the middle ear?

Which set of bones forms the auditory ossicles in the middle ear?

• A. Hammer, Anvil, and Stirrup
• B. Malleus, Incus, and Stapes
• C. Hammer, Anvil, and Cochlea
• D. Malleus, Stapes, and Vestibule

Answer: (B)

In the middle ear, the auditory ossicles form a tiny lever system that transmits sound from the eardrum to the inner ear and helps boost the signal. The three bones are the malleus (hammer), incus (anvil), and stapes (stirrup). They connect in sequence so that the vibration of the eardrum drives the malleus, which moves the incus, which in turn moves the stapes against the oval window of the cochlea. This arrangement transfers sound energy into the fluids of the inner ear and provides a bit of amplification to overcome the impedance mismatch between air and inner-ear fluids. Options that include the cochlea or vestibule are incorrect because those are parts of the inner ear, not the middle-ear bones. The correct trio—malleus, incus, and stapes—are the auditory ossicles.

In the middle ear, the auditory ossicles form a tiny lever system that transmits sound from the eardrum to the inner ear and helps boost the signal. The three bones are the malleus (hammer), incus (anvil), and stapes (stirrup). They connect in sequence so that the vibration of the eardrum drives the malleus, which moves the incus, which in turn moves the stapes against the oval window of the cochlea. This arrangement transfers sound energy into the fluids of the inner ear and provides a bit of amplification to overcome the impedance mismatch between air and inner-ear fluids. Options that include the cochlea or vestibule are incorrect because those are parts of the inner ear, not the middle-ear bones. The correct trio—malleus, incus, and stapes—are the auditory ossicles.