Cervical sinus

Embryonic structure

The cervical sinus is a structure formed during embryonic development. It is a deep depression found on each side of the neck. It is formed as the second pharyngeal arch grows faster than the other pharyngeal arches, so they become covered. The first pharyngeal arch also grows slightly faster. It may fail to obliterate, forming a branchial cleft cyst or fistula, which is prone to infection.

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