During Human embryogenesis the mandibular arch and hyoid arch grow more rapidly than those behind them, with the result that the latter become, to a certain extent, telescoped within the former, and a deep depression, the cervical sinus, is formed on either side of the neck.
Formed by the walls of the 2-4th pharyngeal grooves merging. Sometimes it can remain anterior to the sternocleidomastoid muscle. It can communicate with the skin( external cervical fistula) or with the pharynx (internal cervical fistula). Prone to infection.
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