Excitatory interactions between antagonistic motor neurones underlying locust kicking and jumping during maturation after the adult moult |
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Authors: | A P Norman |
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Institution: | (1) Department of Zoology, University of Cambridge, Downing Street, Cambridge, CB2 3EJ, UK, GB |
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Abstract: | There is a change in the synaptic connections between motor neurones that underlie locust kicking and jumping during maturation
following the adult moult. The fast extensor tibiae (FETi) motor neurone makes monosynaptic excitatory connections with flexor
tibiae motor neurones that have previously been implicated in maintaining flexor activity during the co-contraction phase
of jumping, in which energy generated by the muscles of a hind leg is stored. The amplitude of the FETi spike decreases when
repetitively activated, and this decrement is larger in locusts immediately following the adult moult than in mature locusts.
The decrement in␣the FETi spike is correlated with a greater decrease in the amplitude of the flexor excitatory postsynaptic
potential (EPSP) in newly moulted locusts and in turn with the failure of these locusts to kick or jump. The results presented
here indicate that the developmental change in the connections between the motor neurones contributes to the change in behaviour
following the moult.
Accepted: 28 April 1997 |
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Keywords: | Motor pattern Motor neurone Insect Grasshopper Development Schistocerca gregaria |
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