• C "The ossicles are classically supposed to mechanically convert the vibrations of the eardrum, into amplified pressure waves in the fluid of the cochlea (or inner ear) with a lever arm factor of 1.3. Since the area of the eardrum is about 17 fold larger than that of the oval window, the sound pressure is concentrated, leading to a pressure gain of at least 22. The eardrum is fused to the malleus, which connects to the incus, which in turn connects to the stapes. Vibrations of the stapes footplate introduce pressure waves in the inner ear." Source and further information:
  • The normal order of middle ear bones, from the ear drum (timpanic membrane) to the cochlea are as follows: Malleus, incus, and stapes (hammer, anvil, and stirrup respectively). So "C" would be the correct answer. Unless you are talking about me. In my case, the bones of my right ear are: Malleus, plastic chicken bone, stapes. And in my left ear it's: Malleus and re-engineered incus. This is because I had some ear surgeries to correct a conductive hearing loss in both ears. In my right ear, the incus was removed (incudectomy) and replaced with a plastic prosthetic. I call it a "plastic chicken bone". In my left ear, the stapes was removed (stapedectomy), and the incus was removed, reshaped, and reinstalled to make up for the removed stapes. Additionally, a cholesteatoma tumor was removed and my ear drum rebuilt via skin grafts. So my middle ears are anything BUT perfect representations of Mother Nature's original design! :):):)

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