The collaural fistula is an abnormality of
The collaural fistula is a 1st branchial cleft anomaly which arises from the failure of fusion of the ventral pa of the 1st cleftIts upper pa opens into the floor of the external auditory canalIts lower pa opens in the neck between the angle of the mandible and sternocleidomastoid muscleRef: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 53
1st branchial arch
1st branchial cleft
2nd branchial arch
2nd branchial cleft
Ear