develops from start stage end stage artery primitive prosencephalic artery prosencephalic artery TAO:0005049 zebrafish_anatomy After the primitive prosencephalic artery forms it becomes disconnected from the cranial division of the internal carotid artery and instead it connects to the anterior mesencephalic central artery and the communicating vessels of the palatocerebral artery. PrA ZFA:0005049 unknown hatching:long-pec