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Journal of Experimental Biology 50,771-784 (1969)
Published by Company of Biologists 1969

The Site of Synaptic Activity and Impulse Initiation in an Identified Motoneurone in the Crab Brain

D. C. SANDEMAN ¹

¹ Gatty Marine Laboratory and Department of Natural History, University of St Andrews

1. Recordings with an extracellular focal electrode have been taken from different points along the length of an identified motoneurone in the crab brain.

2. Measurements of changes in the conduction velocity, wave-form and amplitude of orthodromic and antidromic spikes show that the site for impulse initiation is separated from the synaptic site by about 300 µm of axon which does not actively propagate spike potentials.

3. The regenerative axon spike invades this non-excitable region electrotonically, the current being focused at two points: one close to the synapse and one near the impulse-initiating site.