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Non-Homogeneous Conduction In Giant Axons Of The Nerve Cord Of Periplaneta Americana
1 Department of Zoology, The Hebrew University--Hadassah Medical School, Jerusalem, Israel
2 Institute of Psychiatric Research, Indiana University Medical Center, Indianapolis, Indiana
3 Department of Pharmacology, The Hebrew University--Hadassah Medical School, Jerusalem, Israel
Studies with intracellular electrodes show that the abdominal giant axons of the cockroach give ascending responses to stimulation of cercal nerves and descending responses to stimulation of S0-T1 connectives.
2. In the thoracic region one or more areas of low safety factors occur for descending conduction.
3. These areas, which are considered not to be synapses, are blocked by low doses of nicotine (2-5 µg./ml.) fatigued by repetitive stimulation and show conduction delays of 0·6-0·7 msec.
4. It is concluded that the abdominal giant axons extend continuously from A6 to suboesophageal ganglion.
The possibility of bi-directional conduction under physiological conditions is discussed.
Submitted on August 13, 1968
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  H Meiri, M. Spira, and I Parnas Membrane conductance and action potential of a regenerating axonal tip Science, February 13, 1981; 211(4483): 709 - 712. [Abstract] [PDF]
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