embryonic maxillary sensory complex fly_anatomy.ontology embryonic terminal organ Sense organ of the embryonic maxillary segment that gives rise to the terminal organ of the larval head. It is posterior and ventral to the embryonic brain by stage 13 and migrates ventrally and anteriorly to establish its final position, ventral to the dorsal organ, by stage 17. FBbt:00005618 VFB:FBbt_00005618 FBbt:00005618 Drosophila embryonic structure