pharyngeal pouch pharyngeal pouch 1 NCIT:C34176 first arch pharyngeal pouch . [][VHOG] 1st arch pouch endoderm EMAPA:16125 XAO:0000102 EMAPA:16124 UBERON:0007122 A pharyngeal pouch that is between pharyngeal arches 1 and 2. hyomandibular pouch ZFA:0001128 TAO:0001128 The endoderm lines the future auditory tube (Pharyngotympanic Eustachian tube) , middle ear, mastoid antrum, and inner layer of the tympanic membrane. & origin of Mandibular nerve & Maxillary artery In all jawed vertebrates the first arch forms the jaw, while the second arch forms the hyoid apparatus. These two arches are separated by the first pharyngeal pouch and cleft.[well established][VHOG] 1st pharyngeal pouch endoderm FMA:295668 first visceral pouch VHOG:0000970 we use adjacency relations rather than part_of, as in EHDAA2. Wikipedia:Pharyngeal_pouch_(embryology)#First_pouch UBERON:0005718 UMLS:C0231068 AAO:0011114 VHOG:0000555 SCTID:345248006 1st branchial pouch EHDAA2:0000016 1st arch branchial pouch pharyngeal pouches 1 EFO:0003631 first pharyngeal pouch visceral pouch 1 1st arch branchial pouch endoderm zebrafish component