part of develops from larval labial segment embryonic labial sensory complex dorsal ectoderm derivative larval labial sensory complex 2008-11-04T04:17:04Z fly_anatomy.ontology FBbt:00007279 Cluster of two sets of sensilla in the larval labial segment, the labial organ and the ventral pharyngeal sense organ (Campos-Ortega and Hartenstein, 1997). It is found in the atrium, with the labial sensory organ at the base and the labial organ on the lower lip of the external opening (Campos-Ortega and Hartenstein, 1997). sensory cluster