. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 170. Sections through thoracic tympanal organs of Catocala. A, Horizontal section. B, Detail of organ on left side (after Eggers")- «, thorax; h, abdomen; c, tympanal pit; d, tympanum; e, tracheal air sacs; f, chordotonal organs; g, nerve. From Wiggles- ; organ and, at least in some cases, do not have an auditory function. The noncommittal term "scolopidia" is also applied to all "chordotonal" organs, regardless of whether or not they are auditory. The non-auditory scolop
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 170. Sections through thoracic tympanal organs of Catocala. A, Horizontal section. B, Detail of organ on left side (after Eggers")- «, thorax; h, abdomen; c, tympanal pit; d, tympanum; e, tracheal air sacs; f, chordotonal organs; g, nerve. From Wiggles- ; organ and, at least in some cases, do not have an auditory function. The noncommittal term "scolopidia" is also applied to all "chordotonal" organs, regardless of whether or not they are auditory. The non-auditory scolopidia are widespread in the insect body and are found in the legs, antennae, palps, wing bases, and the general body cavity. At least one end is fastened to some pliable region of the cuticle, usually the intersegmental membrane. Any movement, active or passive, of the animal which results in a relative change in the position of two segments is likely to cause stimulation of such scolopidia; they are also sensitive to external pressure, pressure or tension of nearby muscles, and general changes of the internal pressure in the blood or tracheal system. Those attached to tympanic membranes are distinctive only in that they are attached to membranes particularly sensitive to vibra- tion by sound waves in air. Vibration of the substrate which may cause a relative motion of the segments of an insect's body or appendages may cause stimulation of the intersegmental scolopidia. It is also possible that some of the intersegmental scolopidia are auditory in function. The structure of a typical scolopidium is shown in Fig. 171. Each unit consists of a distal or cap cell which surrounds a scolopale, or sense rod, to which is attached the terminal filament of the sense cell. This terminal filament is surrounded by a sheath cell. The sense cell is a primary neurone with its cell body in the base of the scolopidium. These structures are fundamentally the same in all scolopidia, regardless of
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