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Deafness and Hearing Loss

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Submitted By dggie8168
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DEAFNESS
It refers to a hearing loss so severe that the individual cannot process spoken language even with amplification devices.
HARD OF HEARING
A person is considered hard of hearing if he/she generally with the use of a hearing aid, has *residual hearing sufficient to enable successful processing of linguistic information.
TYPES OF HEARING LOSS * Pre-lingual deafness * Occurs before the child has acquired speech * Post-lingual deafness * Occurs after the child has acquired speech
ANATOMY AND PHYSIOLOGY OF THE EAR
3 Major parts of the ear * Outer ear * Middle ear * Inner ear * OUTER EAR
-Consists of the Auricle (part of the ear that protrudes from the side of the head) until the tympanic membrane (eardrum).
-Sound is “collected “ by the Auricle and is funneled through the external auditory canal to the eardrum, which vibrates sending sound waves to the middle ear. * MIDDLE EAR
-Consists of the eardrum and 3 tiny bones * Malleus (Hammer) * Incus (Anvil) * Stapes (Stirrup)
They are contained in an air-filed space. They conduct vibrations of the eardrum to the oval window which is the link between the middle ear and the inner ear. * INNER EAR
-An intricate mechanism of thousand of moving parts.
-Often called a “labyrinth” * Divided into 2 sections: * Vestibular mechanism * Responsible for sense of balance * Cochlea * Most important oragn for hearing * contains the parts necessary to convert the mechanical action of the Middle ear to electric signal in the Inner ear that is transmitted to the brain.
CAUSES
3 Major classifications: 1. Conductive loss
-Impairments that interfere with the transfer of sound along the conductive pathway of the ear.
2. Sensorineural loss -Impairments that involve

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