The method of light microscopy was used in order to study the synapses of motor neurons of the thoracic and lumbar parts of the spinal cord of intact frogs. Under study were the shape of the synapses, their size, as well as the quantitative distribution on the bodies and dendrites of neurons. It was established that the distribution density of active synaptic terminations on the motor neurons of the lumbar part was higher than the density of active synapses in the thoracic part, and the amount of synaptic terminations on dendrites was greater than on the neuron bodies; the snyaptic terminations of different shape were different in size; the occurrence of certain shapes of synaptic terminations in the thoracic and lumbar parts was almost the same.
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