part of embryonic/larval dorsal pouch larval ocular segment sense organ larval mandibular segment sense organ anterior pharyngeal organ apo VFB:FBbt_00002687 fly_anatomy.ontology FBbt:00002687 Sensillum of the lateral part of the embryonic/larval dorsal pouch (Campos-Ortega and Hartenstein, 1997). It contains a single neuron (first seen at embryonic stage 15) that is located dorsal to Bolwig's nerve (at stages 16-17) and fasciculates with the lateropharyngeal nerve (SN-V). Schmidt-Ott et al. (1994) tentatively assign this to the mandibular segment on the basis of its fasciculation pattern. This evidence is much weaker than the genetic evidence they use to determine the segmental identity of other head sensilla.