Chordotonal Organ


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Chordotonal Organ

 

a sensory organ of insects and crustaceans. Chordotonal organs consist of groups of elongate scolopale chordotonal sensillae drawn between two areas of the cuticle or between the cuticle and adjacent tissues. Each sensillum consists of one to three bipolar neurons and two to three auxiliary cells, one of which contains the cylindrical scolopale. Some chordotonal organs are attached to the cuticle by slender ligaments. They may be located on the antennae, mouth, legs, wings, or thorax. Most are proprioceptors, perceiving stimuli from various parts of the body and tissues, especially in the joints of the extremities or between body segments. Chordotonal organs located in the tibias of insects react to vibrations of the surface on which the insect is located, for example, soil and plants.

R. D. ZHANTIEV

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Either strips or, to increase the active area of the sensor rolled-up strips of DEAP material are placed on moving joints on the limb, mimicking functions of the chordotonal organ and muscle, strand and stretch receptors (1 on the right in Fig 2).
Functional principles of pattern generation for walking movements of stick insect forelegs: the role of the femoral chordotonal organ afferences.
A variety of receptors include muscle receptor organs, which measure muscle stretch (Bush, 1977); chordotonal organs, which are articular (joint rotation) receptors measuring stretch around joints; and apodeme receptors and cuticular stress receptors, which record muscular tension via tendons and cuticle respectively (Wales et al.