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Eardrum

From Academic Kids

A left  ear. Image provided by [http://classroomclipart.com Classroom Clip Art
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A left human ear. Image provided by [http://classroomclipart.com Classroom Clip Art
The tympanum or tympanic membrane, known as eardrum, is a thin membrane that separates the outer ear from the middle ear. Its function is to transmit sound from the air to the ossicles inside the middle ear. The malleus bone connects the eardrum to the other ossicles.

There are two general regions of the tympanic membrane: the pars flaccida and the pars tensa. The pars flaccida consists of two layers, is relatively fragile, and is associated with eustachian tube dysfunction. The larger pars tensa region consists of three layers: skin, fibrous tissue, and mucosa. It is comparatively robust, and is the region most commonly associated with perforations.

Rupture of the eardrum can occur in infection, trauma (e.g. by trying to clean the ear with sharp instruments), explosion or loud noise. This leads to conductive hearing loss.

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Sensory system - Auditory system Edit (http://en.wikipedia.org/w/wiki.phtml?title=Template:Auditory_system&action=edit)
Pinna - Ear canal - Eardrum - Ossicles - Cochlea - Basilar membrane - Organ of Corti - Hair cells - Auditory nerve - Primary auditory cortex
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