external auditory meatus

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external auditory meatus

[ek′stərn·əl ′ȯd·ə‚tȯr·ē mē′ād·əs]
(anatomy)
The external passage of the ear, leading to the tympanic membrane in reptiles, birds, and mammals.
References in periodicals archive ?
The chorda tympani nerve may be a useful marker for positioning the facial nerve and keeping the posterior wall of the external auditory canal intact.
Then the internal tympanum was exposed by lifting and pushing the tympanic flap of ear canal skin through the external auditory canal, after which lesions were cleared from two sides of the tympanum and mastoid (Fig.
Tympanometry requires a seal with the external auditory canal because a pressure is applied to the TM to determine TM movement.
3) Inflammatory changes and granulations are noted in the external auditory canal.
A longitudinal fracture through the external auditory canal, middle ear and mastoid bone was present.
Anything which irritates the external auditory canal stimulates the wax glands.
3-6) Cerumen is a mixture of dead epithelial cells and hair combined with secretions of the sebaceous and ceruminous (apocrine) glands in the outer two-thirds of the external auditory canal (EAC).
It can lead to ballooning of external auditory canal which may even cause smooth erosion of bony canal rarely affecting the deeper structures.
Otoscopic examination revealed that a soft-tissue mass with a smooth surface was occupying the entire external auditory canal, and a stalk was adhering to the posterior wall of the canal (figure 1).
Previously Reported Studies: The cul-de-sac characteristics of the external auditory canal encourages the growth of wide range of bacteria and fungi by virtue of its ability to trap moisture thereby predisposing the canal to the development of otitis externa.
This forms a grey-brown to greyish-black coloured thick substance, which gets deposited over and along the wall of superficial and deep external auditory canal.

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