Chordotonal organs are stretch receptor

Stretch receptor

Stretch receptors are mechanoreceptors responsive to distention of various organs and muscles, and are neurologically linked to the medulla in the brain stem via afferent nerve fibers...

 organs in insect

Insect

Insects are a class of living creatures within the arthropods that have a chitinous exoskeleton, a three-part body , three pairs of jointed legs, compound eyes, and two antennae...

s and other arthropods  They are used to detect the position of the body segments and appendages, or, in tympanal organ

Tympanal organ

A tympanal organ is a hearing organ in insects, consisting of a membrane stretched across a frame backed by an air sac and associated sensory neurons...

s, the vibrations caused by sounds. An example for hearing is the Johnston's organ at the base of the antennae. Sound waves deflect hairs on the antennae which causes stretching on the cuticle of the Johnston's organ. This stretching is detected by underlying scolopidia.