The locust abdominal muscle receptor organ: response characteristics and its role in the control of segmental distance |
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Authors: | M Ferber R Hustert |
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Institution: | (1) Present address: Zoologisches Institut, Universität Frankfurt, Siesmayerstrasse 70, D-60323 Frankfurt, Germany;(2) I. Zoologisches Institut, Universität Göttingen, Berliner Strasse 28, D-37073 Göttingen, Germany |
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Abstract: | A single mutipolar receptor cell is located at the dorsal edge of the lateral internal dorsal muscle in each abdominal segment of the locust (Locusta migratoria). Muscle and receptor cell form the abdominal muscle receptor organ. The receptor cell monitors length changes in the intersegmental muscle, and as a consequence also detects the length of an abdominal segment (cuticule and intersegmental membrane).The muscle receptor organ responds in a phasictonic fashion. The phasic component encodes the rate of change in the stimulus independent from the prevailing length of the muscle receptor organ. The tonic component monitors the absolute length of the muscle.Stimulation of a single muscle receptor organ leads to reflex effects on the ipsilateral longitudinal muscles in at least three adjacent segments. Muscles that shorten the abdomen are activated while their extending antagonists receive reduced activity.The reflex activation of the muscles is polysynaptic. Monosynaptic connections between the receptor and the motoneurones were not found.We identified an interneurone that receives monosynaptic input from the muscle receptor organs in at least three adjacent segments. The interneurone excites motorneurones to the longitudinal muscles of the next posterior segment.Abbreviations
aMROII
abdominal muscle receptor interneurone 1
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AS3
third abdominal segment
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AS4
fourth abdominal segment
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AS5
fifth abdominal segment
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AS6
sixth abdominal segment
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EPSP
excitatory postsynaptic potential
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MN
median nerve
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MR
multipolar receptor cell
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MRO
muscle receptor organ
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N1
tergal nerve
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N2
sternal nerve |
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Keywords: | Locust Abdominal muscle receptor organ Resistance reflexes Interneurone Locusta migratoria |
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