[Morphofunctional changes in the synapses of the rabbit sensomotor cortex during the summation reflex].

Synapses of the sensorimotor cortex were studied during summation reflex in chronic experiments on rabbits. Structural changes in presynaptic and postsynaptic components of axodendritic synapses were revealed which are considered as an increase in the functional activity of the synaptic apparatus. The most pronounced response was observed in the postsynaptic matrix, which consisted in a considerable thickening of postsynaptic membranes in a number of axodendritic synapses. It is assumed that the postsynaptic membrane of axodendritic synapses is one of the earliest links structurally fixing the traces of the obtained information.