ABSTRACT
In earlier chapters, the command neuron has been discussed and the cobalt preparations of command neurons displayed a highly developed system of axon branches and dendrites. The same neuron which has already been identified as a command neuron, and which is functionally related to the defense response, can be extracted from the isolated ganglion. Under the microscope, the shape of this neuron can be seen (Fig. 5.1). When the axon of this isolated neuron is cut, the membrane is closed so that the cytoplasm of the neuron is preserved. Such a neuron can live in physiological solution
for several days without the special contribution of any additional substances. This neuron can then be penetrated by microelectrodes, usually using two electrodes. Sometimes, two microelectrodes are put on the soma and two are put within the soma. In some cases, two axonic branches were present (Fig. 5.2).
