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Hearing and the Structure of the Ear

Hearing and the Structure of the Ear

The ear has 3 areas: the outer, middle and inner ear. The outer ear is the ear that you see on the side of your head. It is called the auricle or pinna and its job is to focus sound into the ear. The sound passes through a canal called the external auditory canal that ends at the eardrum. Sound waves hit the eardrum (or tympanic membrane) and make it move (vibrate).

The middle ear (or tympanic cavity) is where you find the 3 smallest bones of the body; the malleus (hammer), incus (anvil) and stapes (stirrup). They send the sound vibrations from the eardrum through the oval window into the inner ear. The middle ear also has an opening into a tube that runs down into the throat (the eustacian tube or auditory tube). Swallowing or yawning opens that tube and equalizes the air pressure in the middle ear. This is called ear popping.

The inner ear is filled with fluid, which collects the vibrations coming from the middle ear and brings them to the hearing receptors. The inner ear is made up of 2 parts; the bony labyrinth and the membranous labyrinth. The bony labyrinth is a cave-like structure, made of bone where the 3 parts of the inner ear sit. The membranous labyrinth is made up of the 3 organs inside the bony labyrinth - the vestibule, semicircular canals and the cochlea. The vestibule and the semicircular canals are involved with keeping your balance and equilibrium and knowing the position of your head (which is important). The cochlea is a spiral shaped chamber (looks like a snail) that houses the "cochlear duct" which has the hearing receptors; the "organ of corti."

To protect your hearing you should never put anything into your ear. Even a cotton swab meant for cleaning earwax should not be put inside your ear canal because it can puncture your eardrum. You also can destroy hearing receptors by listening to really loud music for a long time. Over time it can make you deaf.

Hearing and the Structure of the Ear
Hearing and the Structure of the Ear

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Assessment:

Structure of the Ear - Fill in the Blank

Structures of the Ear Labeling with Vocabulary List

Hearing and the Structures of the Ear - Multiple Choice

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Hearing and the Structure of the Ear

Next Generation Science Standards (NGSS)

LS1.D Information Processing

K-2 Animals sense and communicate information and respond to inputs with behaviors that help them grow and survive.

3-5 Different sense receptors are specialized for particular kinds of information; Animals use their perceptions and memories to guide their actions.

6-8 Each sense receptor responds to different inputs, transmitting them as signals that travel along nerve cells to the brain; The signals are then processed in the brain, resulting in immediate behavior or memories.

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