Abstract
The distribution of acetylcholinesterase (AChE) in the central nervous system of the house cricket, Acheta domesticus L., was investigated by histochemical localization. Abundant enzyme activity was evident in the head in the frontal ganglion, cerebrum, subesophageal ganglion, and optical lobes; and in the thorax in the ganglia and interganglionic connectives. AChE was concentrated in areas of complex synapses but was also present in the cell body region and in interganglionic connectives. The patterns of in situ inhibition of AChE by O,O -dimethyl S -aryl phosphorothioates were investigated. At the hyperactive state of poisoning AChE was reduced throughout the brain and in the peripheral areas of the thoracic ganglia and interganglionic connectives. In the paralytic stage, enzyme activity was still further decreased, and a few hours after knockdown, the enzyme activity had virtually disappeared. However, some spontaneous reactivation of AChE in dead animals was observed after 48 hours.
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