Abstract
The frequency of polyneuronal burst discharges was examined in different regions of the cervical spinal cord (segments 14 and 15) of normal and dystrophic chick embryos from days 18 to 20 of incubation. On the dorsoventral axis in a midlateral position, the pattern of change in burst frequency was quite different in normal and dystrophic embryos. Although bursts were encountered in each, in approximately the same region and at about the same frequency, significant declines in frequency were encountered only in deeper regions of the spinal cord of dystrophic embryos. In normal embryos, bursts maintained their frequency independently of the position of the sampling electrode. If these frequency declines in dystrophic cord are associated with changes in the pattern of motor outflow from this region, they may have consequences in subsequent muscle differentiation.
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