part of develops from mechanosensory sensory organ chordotonal organ scolopidium VFB:FBbt_00005217 fly_anatomy.ontology Sensillum unit of a chordotonal organ, consisting of a cap cell, a ligament cell, a scolopale cell (sheath cell) and the dendrites of one or more sensory neurons. The basal end of the scolopidium is held in place by a ligament cell, usually attached to the integument. The dendrite of each sensory neuron has a cilium projecting from its tip through the scolopale, a rod like structure secreted by the scolopale cell. The cilium terminates in a dendritic cap, embedded in the cap cell. The cap cell is attached to the integument. FBbt:00005217 internal sensillum chordotonal organ sensory mother cell