[Effects of death of a single neuron on the functional organization of the neuronal ensemble in the leech]. / Vliianie gibeli otdel'nogo neirona na funktsional'nuiu organizatsiiu neironnoi seti meditsinskoi piiavki.

The reaction of leech nervous system after elimination of individual mechanosensory neuron by intracellular Pronase injection were studied. In the motor neurons connected with killed cells at 14-90th days after the operation there were the changes of the resting membrane potential and amplitude of postsynaptic potentials developed by the stimulation of mechanosensory neuron. It is suggested that the leech nervous system serves as the dynamic formation depending on changes of neuronal ensemble structure.

[Retraction of processes of remaining cells of the leech nervous system caused by neuron destruction]. / Retraktsiia otrostkov ostavshikhsia kletok nervnoi sistemy piiavki, vyzvannaia gibel'iu neirona.

Individual mechanosensory neurons in the leech segmental ganglia were eliminated in vivo by intracellular Pronase injection. 7-20 days later Lucifer Yellow was injected into mechanosensory neurons of the same modality in isolated ganglia. There was a clear evidence of retraction of neuronal processes. It is suggested that the leech nervous system structure is not necessarily fixed and can be changed after the death of individual neurons.