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J Neurophysiol 80: 994-997, 1998;
0022-3077/98 $5.00
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The Journal of Neurophysiology Vol. 80 No. 2 August 1998, pp. 994-997
Copyright ©1998 The American Physiological Society

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Regeneration of Phasic Motor Axons on a Crayfish Tonic Muscle: Neuron Specifies Synapses

Kristin M. Krause1, Joanne Pearce2, and C. K. Govind2

1 St. Thomas Aquinas College, Sparkill, New York 10976; and 2 Life Sciences Division, University of Toronto at Scarborough, Scarborough, Ontario M1C 1A4, Canada

Krause, Kristin M., Joanne Pearce, and C. K. Govina. Regeneration of phasic motor axons on a crayfish tonic muscle: neuron specifies synapses. J. Neurophysiol. 80: 994-997, 1998. Motor neurons are matched to their target muscles, often forming separate phasic and tonic systems as in the abdomen of crayfish where they are used for rapid escape and slow postural movements, respectively. To assess the role of motor neuron and muscle fiber in forming synapses we attempted a mismatch experiment by allotransplanting a phasic nerve attached to its ganglion to a denervated tonic muscle. Regenerating motor axons sprouted 10-30 branches (typical of phasic motor neurons, as tonic ones sprout far fewer branches) to reinnervate muscle fibers and form synapses that produced large excitatory postsynaptic potentials (typical of phasic motor neurons, as tonic synapses give small potentials). Therefore motor neurons, not muscle fibers, appear to specify one of the major properties of regenerating neuromuscular synapses.






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