THE SITE OF ACTION OF PYRETHRIN I IN THE NERVOUS SYSTEM OF THE COCKROACH PERIPLANETA AMERICANA

Spontaneous nervous activity in the sixth abdominal ganglia of the cockroach is increased by much smaller concentrations of pyrethrin I than are needed to affect conduction in giant fibre axons, suggesting that the fatal lesions caused by pyrethrin I may be within the ganglia rather than associated with axonic conduction.

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