Pharyngeal groove

（重定向自Branchial cleft）

A pharyngeal groove (or branchial groove, or pharyngeal cleft) is made up of ectoderm unlike its counterpart the pharyngeal pouch on the endodermal side.

The first pharyngeal groove produces the external auditory meatus (ear canal). The rest (2, 3, and 4) are overlapped by the growing 2nd pharyngeal arch, and form the floor of the depression termed the cervical sinus, which opens ventrally, and is finally obliterated.

单词	Branchial cleft
释义	Branchial cleft 英语例句库 Most of the thyroglussal duct cyst and branchial cleft cyst were monolocular, while lymphangioma was multilocular. 甲状舌管囊肿及鳃裂囊肿呈单房性，淋巴管瘤多为多房性。英语百科 Pharyngeal groove （重定向自Branchial cleft） A pharyngeal groove (or branchial groove, or pharyngeal cleft) is made up of ectoderm unlike its counterpart the pharyngeal pouch on the endodermal side. The first pharyngeal groove produces the external auditory meatus (ear canal). The rest (2, 3, and 4) are overlapped by the growing 2nd pharyngeal arch, and form the floor of the depression termed the cervical sinus, which opens ventrally, and is finally obliterated.
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