The middle ear is normally air-filled.

Question

Quizplus · Accepted Answer

The middle section is filled with air and contains the tympanic membrane and three ossicles (tiny bones) called the malleus (hammer), the incus (anvil), and the stapes (stirrup). Also in the middle ear is a canal, called the eustachian tube, which leads to a cavity (the pharynx) at the back of the nose. At the innermost region of the middle ear is the oval window, the opening to the inner ear. The middle ear receives the sound waves from the vibrating eardrum and relays them along the three bones to the oval window (see Figure 5-19).

The Middle Ear Is Normally Air-Filled