Human Ear Anatomy and Hearing The Human Ear Outer Ear Middle Ear Inner Ear Semicircular Canals and Balance Loss of hearing Hearing Aids

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Hearing Test Humans can generally hear from 20Hz to 20kHz. See where you fall As we age we lose the ability to hear high frequencies. Click the image to the right to see if you can hear the higher frequencies How old are your ears? In slideshow mode, click on the images above to see how your videos are embedded into the lesson.

The Human Ear – The Anatomy of Hearing The human ear consists of three basic parts: The Outer Ear The Middle Ear The Inner Ear

The Outer Ear _____________ Is shaped to collect sounds Notice how cupping your ear exaggerates its natural shape and increases its ability to gather sound

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The Middle Ear Continued There are three connected bones (the ossicles) which attach to the eardrum __________ These bones magnify and transmit the vibrations to the inner ear In slideshow mode, click on the images above to see how your videos are embedded into the lesson.

The Middle Ear Continued The middle ear is filled with air and is connected to the mouth via the Eustachian tube This passage usually remains closed, trapping the air inside Pressure can buildup in the middle ear during altitude changes causing pain __________

The Inner Ear The inner ear contains a structure which resembles a snail shell called the cochlea which is filled with fluid _____________

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Semicircular Canals Found within the inner ear and contains fluid Three canals ………………. As the head moves in all directions, the fluid moves ____________ The brain uses this information to maintain the bodies balance

Vertigo If something happens to this balance created in your semicircular canals, you can experience vertigo __________ It leads to feelings of nausea, headache, etc. Can be caused by ………… Can last from minutes to weeks at a time

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Hearing Aids Is an electronic device which allows a deaf person to hear sounds Basic models simply amplify the sound and send it directly into the ear canal Other devices can bypass the outer ear and cause direct vibrations on the bones of the middle ear In more extreme cases, the outer and middle ear can be bypassed completely and __________