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On average, people can hear sounds in the frequencies between 20 to 20,000 Hertz.
anvil - (also called the incus) a tiny bone that passes vibrations from the hammer to the stirrup.
cochlea - a spiral-shaped, fluid-filled inner ear structure; it is lined with cilia (tiny hairs) that move when vibrated and cause a nerve impulse to form.
eardrum - (also called the tympanic membrane) a thin membrane that vibrates when sound waves reach it.
Eustachian tube - a tube that connects the middle ear to the back of the nose; it equalizes the pressure between the middle ear and the air outside. When you "pop" your ears as you change altitude (going up a mountain or in an airplane), you are equalizing the air pressure in your middle ear.
hammer - (also called the malleus) a tiny bone that passes vibrations from the eardrum to the anvil.
nerves - these carry electro-chemical signals from the inner ear (the cochlea) to the brain.
outer ear canal - the tube through which sound travels to the eardrum.
pinna - (also called the auricle) the visible part of the outer ear. It collects sound and directs it into the outer ear canal
semicircular canals - three loops of fluid-filled tubes that are attached to the cochlea in the inner ear. They help us maintain our sense of balance.
stirrup - (also called the stapes) a tiny, U-shaped bone that passes vibrations from the stirrup to the cochlea. This is the smallest bone in the human body (it is 0.25 to 0.33 cm long).
Senses: Write Eight Hearing-Related Words
Think of and write eight hearing-related adjectives, describing how things sound. Sample answers: loud, soft, quiet, noisy, raspy, high-pitched, low-pitched, rumblng.
Label the ear anatomy diagram.
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