part of campaniform sensillum of ventral radius campaniform sensillum of ventral radius Sc4v campaniform sensillum of ventral radius Sc4vm sensillum campaniformium of ventral radius Sc4vm FBbt:00004349 v.Rad.A fly_anatomy.ontology VFB:FBbt_00004349 sensillum campaniformium of ventral radius Sc4v Campaniform sensillum of the proximal radius on the ventral surface of the adult wing. There are four or five elliptical sensilla with low profile and with a socket (type 6), often arranged in a diamond pattern. Each sensillum is between 2.5-3.5 micrometers in length. proximal radius