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J Neurophysiol 41: 1-8, 1978;
0022-3077/78 $5.00
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Journal of Neurophysiology, Vol 41, Issue 1 1-8, Copyright © 1978 by APS

ARTICLES

Temperature-sensitive conduction failure at axon branch points

M. Westerfield, R. W. Joyner and J. W. Moore

1. The propagation of action potentials through the branching regions of squid axons was examined experimentally and with computer simulations over a temperature range of 5-25 degrees C. 2. Above a critical ratio of postbranch to prebranch diameters, propagation of an action potential failed. The value of this critical ratio is very sensitive to temperature and is smaller at high temperatures. The experimentally measured Q10 of the critical ratio is 0.37 +/- 0.04. 3. Evaluation of a number of parameters of action-potential propagation showed that this effect is closely related to the change in the width of the action potential with temperature (Q10 = 0.29 +/- 0.01).


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