Figure 10.

Ventral root stimulation was used to evoke recurrent IPSCs recorded in motoneurons to perform quantal analysis to estimate for the number of release sites from the population of Renshaw cells. Responses from a motoneuron (final component of the stimulus artifact subtracted) are shown alongside their respective amplitude distributions observed during applications of extracellular calcium concentrations of 1 mm (A) and 2 mm (B). BQA results are illustrated using probability distributions for the quantal size (C; q) and maximal response (D; r), and number of release sites (E; n).