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Embryology and Anatomy of Ear

Question
63 out of 70
 

True regarding "Preauricular sinus" is:



A Improper fusion of auricular tubercles

B Persistent opening of first branchial arch

C Autosomal recessive

D pattern

Ans. A Improper fusion of auricular tubercles Ref. Dhingra 6/e p 77

This is commonly seen at the root of helix and is due to incomplete fusion of tubercles during

Development of external ear

It is a blind track lined by squamous epithelium

It may get repeatedly infected causing purulent discharge

Abscess may also form

Treatment is surgical excision of the track if the sinus gets repeatedly infected.

Also Know

Collaural Fistula

It is an anomaly of first brachial cleft:

In this, there is one opening in the floor of external auditory meatus and another behind the angle of mandible close to anterior border of sternocleidomastoid

Tract of fistula passes through parotid in close proximation to facial nerve

Treatment is excision of tract

Embryology and Anatomy of Ear Flashcard List

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