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The tragus is a key feature in many bat species. As a piece of skin in front of the ear canal, it plays an important role in directing sounds into the ear for prey location and navigation via echolocation. [6] Because the tragus tends to be prominent in bats, it is an important feature in identifying bat species. [7]
A preauricular fistula, which is a long narrow tube, usually near the tragus. This can be inherited as an autosomal recessive fashion and may suffer from chronic infection in later life. [8] Cosmetic defects, such as very large ears, small ears. [9] [10]
Congenital auricular fistula, Congenital preauricular fistula, Ear pit, [1]: 782 ...
Proper, custom made jewelry can reduce the risk of migration associated with these piercings, although it cannot eliminate it. This type of migration is sometimes accompanied by rejection due to improper drainage due to the length of piercing, as dead tissue builds up in the healing fistula.
A labyrinthine fistula is an abnormal opening in the inner ear. This can result in leakage of the perilymph into the middle ear. [ 1 ] This includes specifically a perilymph fistula ( PLF ), an abnormal connection between the fluid of the inner ear and the air-filled middle ear .
An oroantral fistula (OAF) is an epithelialized oroantral communication (OAC), which refers to an abnormal connection between the oral cavity and the antrum. [1] The creation of an OAC is most commonly due to the extraction of a maxillary tooth (typically a maxillary first molar ) which is closely related to the antral floor.
Tracheoinnominate fistula (TIAF or TIF) is an abnormal connection between the innominate artery (brachiocephalic trunk or brachiocephalic artery) and the trachea. A TIF is a rare but life-threatening iatrogenic injury, usually the sequela of a tracheotomy .
Frank's sign is a diagonal crease in the ear lobe extending from the tragus across the lobule to the rear edge of the auricle. [1] The sign is named after Sanders T. Frank. [1] It has been hypothesised that Frank's sign is indicative of cardiovascular disease [2] [3] and/or diabetes. [4]