![]() In addition to protecting the eardrum, the external auditory canal also functions as a natural hearing aid which automatically amplifies low and less penetrating sounds of the human voice. At the same time, earwax (cerumen) in the external auditory canal functions as a barrier to help keeping unwanted materials like dirt, dust, and insects out of the human ear. In order to protect the eardrum, the auditory canal is slightly curved making it more difficult for insects, for example, to reach the eardrum. Pressure from sound waves makes the eardrum vibrate. The eardrum is an extremely sensitive part of the outer ear anatomy. It is a membrane at the end of the auditory canal and marks the beginning of the middle ear. What is the eardrum? The eardrum (tympanic membrane) is another important part of the outer ear. The external auditory canal’s function is to transmit sound from the pinna to the eardrum. Once the sound waves have passed the pinna, they move two to three centimetres into the auditory canal before hitting the eardrum, also known as the tympanic membrane. The pinna functions as a kind of intermediate link which makes the transition smoother and less brutal allowing more sound to pass into the auditory canal (meatus). This is where the pinna helps by overcoming the difference in pressure inside and outside the ear. In order for the sound waves to enter the ear in the best possible way the resistance must not be too high. Unilateral hearing loss - Single sided deafness.
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