[Features of the ultrastructural organization of neurons with a septal reticulum].

The electron microscopical study of the crayfish stretch receptor neuron, with a distinctive system of the smooth endoplasmic reticulum (SER) cisternae lying at intervals (2 mcn apart) normal to the long axis of axons and dendrites, has revealed a direct continuity of the SER with the outer membrane of mitochondria. Subsurface cisterns were discovered in the neuron. It is concluded that these may be part of cell SER network. A new type of the synapse interaction between excitatory and inhibitory fibres and the stretch receptor neuron dendrite has been described.