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Lateral giant fibre activation of exopodite motor neurones in the crayfish tailfan

Nagayama, T., Araki, M. and Newland, P.L. (2002) Lateral giant fibre activation of exopodite motor neurones in the crayfish tailfan Journal of Comparative Physiology A, 188, (8), pp. 621-630. (doi:10.1007/s00359-002-0337-3).

Record type: Article


The uropods of decapod crustaceans play a major role in the production of thrust during escape swimming. Here we analyse the output connections of a pair of giant interneurones, that mediate and co-ordinate swimming tail flips, on motor neurones that control the exopodite muscles of the uropods. The lateral giants make short latency output connections with phasic uropod motor neurones, including the productor, the lateral abductor and adductor exopodite motor neurones that we have identified both physiologically and anatomically. On the other hand, tonic motor neurones, including the ventral abductor and reductor exopodite motor neurones, receive no input from the lateral giants. We show that there is no simple reciprocal activation of the phasic opener (lateral abductor) and closer (adductor) motor neurones of the exopodite, but instead both phasic motor neurones are activated in parallel with the productor motor neurone during a tail flip. Our results show that the neuronal pathways activating the tonic and phasic motor neurones of the exopodite are apparently independent, with phasic motor neurones being activated during escape movements and tonic motor neurones being activated during slow postural movements.

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Published date: September 2002
Keywords: escape behaviour, giant fibre, local circuits, motor neurone, tail flip
Organisations: Biological Sciences


Local EPrints ID: 56579
ISSN: 0340-7594
PURE UUID: 4990221b-44aa-47b5-813e-b638816014e2

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Date deposited: 08 Aug 2008
Last modified: 17 Jul 2017 14:30

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Author: T. Nagayama
Author: M. Araki
Author: P.L. Newland

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