ABSTRACT
Stimulation of the connectives between the suboesophageal and prothoracic ganglia of the American cockroach induced ipsilateral descending spikes in the abdominal giant axons with an average delay of 0·6 msec, per thoracic ganglion.
Nicotine at 5 μ g./ml. had no effect on conduction in the abdomen but blocked ascending responses sequentially at the 6th abdominal ganglion then at the levels of T1; T2, and T3.
Simultaneous descending and ascending impulses resulted in mutual extinction along the nerve cord with the point of collision depending on the interval between stimuli.
It is suggested that a common pathway subserves ascending and descending giant impulses and models for bi-directional conduction are discussed.
Copyright © 1969 The Company of Biologists Ltd.
1969
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