The organization of exteroceptive information from the uropod to ascending interneurones of the crayfish |
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Authors: | T Nagayama M Sato |
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Institution: | (1) Zoological Institute, Faculty of Science, Hokkaido University, 060 Sapporo, Japan;(2) Present address: Laboratory of Biology, Rakunou-Gakuen University, 069 Ebetsu, Japan |
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Abstract: | The organization of exteroceptive inputs to identified ascending interneurones of the crayfish, Procambarus clarkii (Girard), has been analyzed by stimulation of hairs on the uropod and simultaneous intracellular recordings from ascending interneurones. The spikes of single afferent neurones which innervated hairs on the distal ventral surface of the exopodite were consistently followed by a depolarizing synaptic potential in many identified ascending interneurones with a constant and short central delay of 0.7–1.5 ms. The amplitude of the potentials depended on the membrane potential of the ascending interneurones. Each afferent neurone made divergent outputs onto several ascending interneurones and each ascending interneurone received convergent inputs from several afferent neurones. Certain ascending interneurones made inhibitory or excitatory connections with other ascending interneurones. These central interactions were always one-way, and the spikes from one ascending interneurone consistently evoked excitatory or inhibitory post-synaptic potentials in other interneurones which followed with a constant and short latency of 0.7–1.0 ms. The inhibitory postsynaptic potential was reversed by injection of steady hyperpolarizing current.Abbreviations EPSP
excitatory post-synaptic potential
- IPSP
inhibitory post-synaptic potential |
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Keywords: | Crayfish Ascending interneurones Terminal abdominal ganglion Direct connection Exteroceptive inputs |
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