develops from start stage end stage artery aortic arch 1 opercular artery zebrafish_anatomy external carotid artery TAO:0005022 ZFA:0005022 The opercular artery arises from the hyoid stump on the first aortic arch, then follows the lateral margin of the operculum (gill covering) ventrally to reconnect into the proximal part of the first aortic arch. ORA hatching:long-pec adult