Cross-section of a campaniform sensillum. Each sensillum is embedded in a cuticular socket and innervated by a single sensory neuron. The neuron is excited when strain in the cuticle deforms the socket edges (collar) and indents the flexible cuticular dome (cap).Top panel: Scanning electron micrograph (SEM) of campaniform sensilla on the tarsus of Drosophila melanogaster. Bottom panel: SEM of campaniform on the base of the haltere of a sarcophagid fly.
Campaniform sensilla are a class of mechanoreceptors found in insects, which respond to local stress and strain within the animal's cuticle. Campaniform sensilla function as proprioceptors that detect mechanical load as resistance to muscle contraction,[1][2] similar to mammalian Golgi tendon organs.[3][4] Sensory feedback from campaniform sensilla is integrated in the control of posture and locomotion.[5][6]
^Zill S, Schmitz J, Büschges A (July 2004). "Load sensing and control of posture and locomotion". Arthropod Structure & Development. 33 (3): 273–86. doi:10.1016/j.asd.2004.05.005. PMID18089039.