Apharyngeal groove (orbranchial groove, or pharyngeal cleft[1]) is made up of ectoderm unlike its counterpart the pharyngeal pouch on the endodermal side.
| Pharyngeal groove | |
|---|---|
Pattern of the branchial arches. I-IV branchial arches, 1-4 pharyngeal pouches (inside) and/or pharyngeal grooves (outside)
aTuberculum laterale bTuberculum impar cForamen cecum dDuctus thyreoglossus eSinus cervicalis | |
| Details | |
| Precursor | Ectoderm |
| Identifiers | |
| Latin | sulcus pharyngei |
| TE | groove_by_E5.4.2.0.0.0.3 E5.4.2.0.0.0.3 |
| Anatomical terminology | |
The first pharyngeal groove produces the external auditory meatus (ear canal).[2] The rest (2, 3, and 4) are overlapped by the growing second pharyngeal arch, and form the floor of the depression termed the cervical sinus, which opens ventrally, and is finally obliterated.
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