Table I

Characteristics of Spontaneous and Evoked Synaptic Currents at the Preformed Synapses and the Middle Axon

Average SSC frequencyAverage SSC amplitudeAverage ESC amplitudeDelay of onset of ESCRatio of ESC amplitude/ SSC frequencyCoefficient of variation for ESC
events/minpApAms
Preformed synapse10.4 ± 0.7*158 ± 122,334 ± 179*1.96 ± 0.04266 ± 320.52 ± 0.11
Middle axon 6.2 ± 0.8*        112 ± 9    1,135 ± 82*1.89 ± 0.05286 ± 540.68 ± 0.14
  • Data were obtained by recording membrane currents in the myocytes manipulated into contact with the middle axonal segment of a neuron (Middle axon) and from the spontaneously formed synapses (Preformed synapse). All parameters of SSCs and ESCs were determined for each recording before averaging. In each experiment at least 20 SSCs and five ESCs were analyzed. The data are presented as mean ± SEM of 15–54 different experiments. The data at the preformed synapses and the middle axonal segments were compared by t test.  

  • * ,  P < 0.05.