BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Grommet. Artwork of the internal ear, showing a grommet in place in the eardrum. A grommet is a device used to treat the condition otitis media, in which the middle ear fills up with fluid or pus. It is caused by an infection in the eustachian tube (diagonal to bottom right), which connects the nasal cavity and the middle ear and is responsible for maintaining equal pressure between them. When this fills with pus, the ear pressure cannot be altered, impairing hearing, and causing pain. A grommet (upper centre, and centre in eardrum) is a thin tube placed in the eardrum to allow drainage of fluid and pressure equilibrium.
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