Physics of the Ear
The ear is an extraordinary human organ that many people take for granted until it doesn’t function. It is the only device that allows the human to hear sounds in their environment. The ear is made up of many parts that distinguish various sounds through different means. The ear anatomy and physiology along with how sound waves are transmitted into meaningful sounds will help one understand how hearing loss occurs.
The ear is made up of three areas: the outer, middle, and inner ear. The outer ear is very important for collecting sound waves. It is made up of the pinna and the ear canal. The pinna, the actual physical outward appearance of the ear, receives sound waves and begins to funnel them into the ear canal. The ear canal is also known as the auditory meatus which is basically a convoluted tube. The next part of the ear, the tympanic membrane, is the beginning of the middle ear. The ear drum is crucial in the ability to hear. The tympanic membrane leads to a chain of small bones known as the malleus (hammer), incus (anvil), and the stapes (stirrup). The stapes is ended with the footplate, a bone that looks like a stirrup. This area is known as the middle ear or the tympanic cavity. Located at the bottom of this area is the Eustachian tube which leads down to the throat. Its main purpose is to maintain the equalization of pressure between the tympanic cavity and the atmosphere as the air in the cavity is absorbed by the cells of its surface. The next area is the inner ear. This area contains many important structures to the hearing process. It begins with the oval window which is struck by the footplate of the Stapes. The cochlea is the area where most sound is transmitted from waves into impulses. W...
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... environment. In order to do that we must know the anatomy of our ear and how it functions. An important function is how the sound wave is transmitted into meaningful information through means of frequency, amplitude, and location. By understanding how the ear functions people are able to understand and prevent hearing loss.
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Littler, T.S. The Physics of the Ear, v3. NY: Macmillan Company. 1965. P- 1-9
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Tanner, D.C. (2003). Chapter 6: Hearing Loss and Deafness. In Exploring communication disorders: A 21st century introduction through literature and media (2nd ed., p.192). Boston, Massachusetts: Allyn and Bacon.
Hearing allows us to take in noises from the surrounding environment and gives us a sense of where things are in relation to us. All those little folds on the outside of the ear, called the tonotopic organization, make it so sound waves in the air are directed to the ear canal, where they can be further processed. Once in the ear, the sound waves vibrate the ear drum, which tell the ear exactly what frequency it is sensing. The vibration of the ear drum is not quite enough to send a signal to the brain, so it needs to be amplified, which is where the three tiny bones in the ear come into play. The malleus or hammer, incus or anvil, and stapes or stirrup amplify this sound and send it to the cochlea. The cochlea conducts the sound signal through a fluid with a higher inertia than air, so this is why the signal from the ear drum needs to be amplified. It is much harder to move the fluid than it is to move the air. The cochlea basically takes these physical vibrations and turns them into electrical impulses that can be sent to the brain. This is...
In today’s society, one of the most natural human traits is selfishness. David Foster Wallace incorporated this idea in his commencement speech at Kenyon College in 2005. Wallace aims to persuade his audience that, “the most obvious, ubiquitous, important realities are often the ones that are the hardest to see and talk about.” Although the intended audience of his speech is the graduates and staff, along with their friends and family, the piece has become quite popular since its delivery. Wallace offers, “nothing less than the truth” and captivates the listeners with his complete honestly. His personal tone lets the audience feel like they are a part of the conversation, rather than just receiving it. Wallace successfully conveys his message that society is blind to the world around them through the use of logic, humility and emotional appeals.
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From this point, vibration of the connective membrane (oval window) transforms mechanical motion into a pressure wave in fluid. This pressure wave enters and hence passes vibrations into the fluid filled structure called the cochlea. The cochlea contains two membranes and between these two membranes, are specialized neurons or receptors called hair cells. Once vibrations enter the cochlea, they cause the lower membrane (basilar membrane) to move in respect to the upper membrane (i.e. the tectorial membrane in which the hair cells are embedded). This movement bends the hair cells to cause receptor potentials in these cells which in turn cause the release of transmitter onto the neurons of the auditory nerve.
...step up to take care of their responsibilities, then a lot of young women wouldn’t be homeless. Also there’s not enough affordable daycares.
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The larynx, known as the voice box, consists of an outer casing of nine cartilages that are connected to one another by muscles and ligaments. There are three unpaired cartilages and six paired. The unpaired cartilages include the thyroid, cricoid, and epiglottis. The thyroid cartilage is the largest and better known as the Adam’s apple. The cricoid cartilage is the most inferior cartilage of the larynx which forms the base of the larynx on which the other cartilages rest. Together, the thyroid and cricoid cartilages maintain an open passageway for air movement. The epiglottis and vestibular folds, or false vocal chords, prevent swallowed material from moving into the larynx. The paired cartilages, accounting for the remaining six, include the arytenoid (ladl...
The human ears are sensory organs that consist of the auditory system and the vestibular system. “It divides anatomically and functionally into three areas. The external ear, the middle ear, and the outer ear.” These regions are involved in hearing, but only the inner ear is deals with balance. The Vestibular System is responsible for our balance. It encompasses the semicircular canal system, three semicircular and the vestibule that detect rotational movements and sends it to the central nervous system. The auditory system is responsible for the sense of hearing. It encompasses the cochlea, three fluid filled sections that translates sound into electrical signals in the central nervous.
The ear is an organ of the body that is used for hearing and balance. It is connected to the brain by the auditory nerve and is composed of three divisions, the external ear, the middle ear, and the inner ear. The greater part of which is enclosed within the temporal bone.