About Your Hearing
The ear is a sophisticated organ that transmits the sounds we hear into electrical impulses that are interpreted by the brain. The process of hearing and interpreting sound is accomplished at a fantastic speed. To achieve this remarkable feat, each part of the ear – outer, middle and inner ear – fulfills a specific function.
The outer ear is composed of the pinna, the familiar visible portion of the ear, and the ear canal. The shape of the outer ear serves to give preference to sounds originating from the front. The shape of the ear canal serves to enhance frequencies that are important for hearing speech.
The middle ear consists of the eardrum, or tympanic membrane, and three tiny ear bones, or ossicles. The ossicles are the smallest bones in the human body. Although named the malleus, incus and stapes, they are often referred to as the hammer, anvil and stirrup because of their characteristic shape. Besides their role in the transmission of sound, these bones help to protect the ear from damage by constricting and limiting sound transmission when sound is too loud. The middle ear also contains the Eustachian tube, which connects with the throat, and serves to ventilate and regulate pressure in the middle ear.
The inner ear is composed of the semi-circular canals, which are important for balance, and the fluid-filled, snail-shaped hearing organ, the cochlea.
Transmission of Sound
The funnel shaped outer ear functions to collect sound waves which are then transferred through the ear canal to the eardrum.
Sound waves cause the eardrum to vibrate. This vibration stimulates the movement of the middle ear bones, which are attached to the eardrum on the middle ear side. These bones amplify the vibrations received by the eardrum and transmit them to the oval window, a small membrane on the cochlea, which separates the middle ear from the inner ear.
On the cochlear side of the oval window is fluid (or lymph) which fills the cochlea. Vibration of the oval window causes pressure waves within the cochlear fluid. The pressure waves stimulate movement of thousands of acoustic hair cells in the cochlea, converting the sound signal into electrical stimuli via neurons. These electric stimuli are transmitted to the brain via the eighth cranial nerve, or auditory nerve. In the brain these stimuli are processed and are perceived as sound.
Check Your Hearing
The following questions will help you determine if you, or a loved one, should have a hearing test performed by a Hearing Health Care Professional. Remember, detection of a hearing problem is the first step to improving your hearing health.
Do I have a hearing loss?
- Do people always comment that the volume on your TV or radio is too loud?
- Have you missed visits and calls from people because you didn’t hear the doorbell or telephone ringing?
- Do you have trouble following conversation in crowded or noisy settings?
- Do people seem to mumble and not speak clearly during conversation?
- Do people tell you that you speak too loudly in conversation?
- Do you frequently ask people to repeat themselves?
- Do your friends and family suggest that you have a hearing problem?
- Do you have a difficult time understanding the words of popular songs when listening to the radio?
- Does someone I know have a hearing loss?
- When you come to visit does the person you know hear your knock on the door or the doorbell?
- Does the person you know complain about having a difficult time hearing on the telephone?
- Does the person you know always ask you and others to repeat yourselves?
- In crowded settings, does the person you know complain about not understanding what people are saying?
- Does the person you know always turn the volume on the TV or radio up to an uncomfortable level just to hear a program or music?
- Does the person you know often complain of ringing in the ears?
If you answered "YES" to any of these questions, you or your loved one may want to have a hearing test to determine if there’s some degree of hearing loss. Contact our office to schedule your appointment.