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Information About Perforated Eardrum

Barotrauma
Cholesteatoma
Deafness
Ear Infections
Earache
Eardrum perforation
Earwax
Labyrinthitis
Meniere Disease
Otitis Media
Otosclerosis
Ototoxicity
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  Perforated Eardrum
 
The tympanum or tympanic membrane, colloquially known as the 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.

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.

Development

The tympanic membrane forms from the joining of the expanding first pharyngeal pouch and groove. Around day 30 of gestation, the endoderm-lined first pharyngeal pouch expands to form the tympanic cavity, which subsequently envelops the inner ear ossicles. Simultaneously, the first pharyngeal groove, which is lined with ectoderm, expands to form the developing external auditory meatus. Separated by a thin layer of mesoderm, the tympanic cavity and external auditory meatus join to form the tympanic membrane. As a result, the tympanic membrane is one of very few adult structures that is derived from all three germ layers.



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