The sensory neurons of the femoral chordotonal organ encode various kinematic features of the femur/tibia joint including, position, speed, acceleration, and vibration. In Drosophila, where it is possible to genetically track different subtypes of femoral chordotonal neurons, it is known that these different kinematic features are encoded by anatomically distinct subtypes of neurons mentioned above (Figure 2). The position of the tibia is encoded by the claw neurons, vibrations are encoded by the club neurons, and the direction of the movement is encoded by the hook neurons.
