overlaps pharyngeal arch 2 pharyngeal pouch pharyngeal arch 1 pharyngeal pouch 1 NCIT:C34176 first arch pharyngeal pouch 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 1st pharyngeal pouch endoderm FMA:295668 first visceral pouch VHOG:0000970 Wikipedia:Pharyngeal_pouch_(embryology)#First_pouch AAO:0011114 VHOG:0000555 SCTID:345248006 1st branchial pouch EHDAA2:0000016 1st arch branchial pouch EFO:0003631 first pharyngeal pouch visceral pouch 1 1st arch branchial pouch endoderm