How the outer ear works; the average; internal? Find their components on the second flyleaf.

Each ear consists of three sections: the outer, middle and inner ear. The outer ear is formed by the auricle and the auditory meatus, which ends with the eardrum. The auricle, which is a cartilaginous formation, directs sound waves into the external auditory canal. Sound waves cause vibrations of the eardrum that separates the outer ear from the middle. In the middle ear there are three small auditory ossicles (malleus, anvil, stapes), which transmit the vibrations of the eardrum to the membrane of the oval window that separates the middle ear from the inner one. Due to the presence of a round window membrane, the fluid of the inner ear accurately repeats these vibrations. The inner ear is located inside the temporal bone. Unlike previous sections, it is not filled with air, but with liquid. In the inner ear there is a vestibule, a cochlea (hearing organ) and an organ of balance.

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