develops from develops from developing anatomical structure endo-epithelium pharyngeal pouch 1 epithelial sac tubotympanic recess epithelium UBERON:0010020 VHOG:0001297 EHDAA:6772 SCTID:361516008 The tympanic cavity and auditory tube of an amniote develop from the first embryonic pharyngeal pouch, so they are homologous to the first gill pouch, or spiracle, of a fish. We are uncertain whether this homology strictly applies to the middle ear cavity and auditory tube of lissamphibians, which show certain peculiarities in their development.[well established][VHOG] The dorsal portion of the embryonic first endodermal pharyngeal pouch; it develops into the middle ear cavity. EHDAA2:0004115 NCIT:C34318 tubotympanic recess EMAPA:17002 MA:0001218 UMLS:C1284046 middle ear epithelium