Impedance Audiometry/ Immittance Testing
Test that determines the presence of middle ear fluid, middle ear pressure, mobility of the eardrum and the middle ear bones, and Eustachian tube function.

Incus (anvil)
One of the three small bones in the middle ear; shaped like an anvil, attached to the malleus and the stapes; helps to amplify the sound coming from the outer ear.

Inner Ear
Includes the semicircular canals, the cochlea, and the auditory nerve. Problems in this part of the ear may include damaged or missing nerve cells and damage to the balance mechanism.

Intensity
Volume or loudness; measured in decibels (dB).