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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. This sinus is bounded in front by the hyoid arch, and behind by the thoracic wall; it is ultimately obliterated by the fusion of its walls. 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 fistuala). Prone to infection. ==Additional images== File:Gray947.png|The head and neck of a human embryo thirty-two days old, seen from the ventral surface. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「cervical sinus」の詳細全文を読む スポンサード リンク
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