The turtle ear is a simple structure that sits caudoventral to the eye covered by a large scale called the tympanic scute. As in many reptiles, the external ear is absent in chelonians. The tympanic membrane sits flush against the skin just underneath the tympanic scute. There is one ossicle, the columella, which crosses the large tympanic cavity to insert medially on the oval window of the cochlea. A narrow Eustachian tube connects the middle ear to the oropharynx.
Aural abscesses are well-encapsulated, caseous plugs that slowly develop until it fills the tympanic cavity. The cause of aural abscessation . . .
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References
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Further reading
McKlveen TL, Jones JC, Holladay SD. Radiographic diagnosis: aural abscess in a box turtle. Vet Rad Ultrasound 41(5):419-421, 2000.
Pollock C. Presenting problem: Aural abscess in turtles. July 22, 2013. LafeberVet Web site. Available at https://lafeber.com/vet/presenting-problem-aural-abscess-in-turtles/