The structural-functional relationships of sensorimotor connections were studied in isolated lumbar cord segments of 7-14 day-old rats. Individual motoneurons were found to have synaptic contacts only with a single collateral of the afferent fibre. The number of contacting boutons gained 10. The n parameter of the binomial model was established to reflect the number of contacts at the sensorimotor connection. The analysis of sensorimotor EPSPs by convolution with two binomial distributions has shown that sites of the transmitter release were different in their probability (efficiency) of response to nerve impulse.
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