Abstract
In chromatolysed hypoglossal motoneurons impulse transmission from the initial segment to the soma-dendritic membrane, the relationship of firing frequency to stimulating current, and the trajectory of antidromic responses were explored. In some axotomized motoneurons by the 7th post-operative day the initial segment component could not be separated from the soma-dendritic component. No significant changes were observed on inhibitory postsynaptic potentials produced by lingual nerve stimulation in comparison with normal motoneurons. The slope of the primary range showed a high gain in relation to stimulating current in axotomized motoneurons 14 days after axotomy. On the 28th post-operative day most axotomized motoneurons produced a large delayed depolarization following an antidromic spike. From these findings it is suggested that hypoglossal motoneurons undergoing chromatolysis have a high safety factor for impulse transmission from the initial segment component to the soma-dendritic component and a low threshold for the generation of a spike in the soma-dendritic membrane.
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