Medical Interventions 1.3

Amplitude

Sound intensity is determined by

Decibles

Amplitude is measured in

Pitch

This is determined by sound's frequency

Hertz

Frequency is measured in

Conductive hearing loss

Hearing loss or impairment resulting from interference with the transmission of sound waves to the cochlea. (mechanical)

Sensoruneural hearing loss

Hearing loss or impairment resulting from problems with the auditory nerves.

Normal Hearing

0-20 dB

Mild hearing loss

21-40 dB

Moderate hearing loss

41-55 dB

Moderate to severe hearing loss

56-70 dB

Severe hearing loss

71-90 dB

Profound hearing loss

90>

Cochlear Implant

An electrical prosthetic device that enables individuals with sensorineural hearing loss to recognize some sounds and that consists of an external microphone and speech processor that receive and convert sound waves into electrical signals which are transmitted to one or more electrodes implanted in the cochlea where they stimulate the auditory nerve

Hearing aid

An electronic device usually worn by a person for amplifying sound before it reaches the receptor organs

Rinne Test

Uses a 512 Hz tuning fork on the mastiod bone and auditory meatus

Audiometric test

Uses sounds at 250 Hz - 4000 Hz and tests to see at what decible the sound can be heard

Pinna

External part of the ear in humans and mammals. (cartilage)

Auditory Canal

a passage from the outer ear to the ear drum along which sound waves travel

Eustachian tube

equalizes the pressure of each side of the ear drum

Ossicles

small bones in the middle ear

Ear drum

membrane of the middle ear that vibrates in repsonse to sound waves

Cochlea

spiral cavity in the inner ear which produces nerve impulses in repsonse to sound vibrations

Sensory hair cells

sensornueral hearing loss occurs if there is a decrease in these

Cochlear nerve

conveys sensory impulses from ear to brain

Oval window

leads from middle ear to inner ear

Vestibular nerve

inner ear to brain

Oval window

membrane at the enterance to the cochlea through which the ossicles transmit vibrations