Journal of Neuroscience, Vol 6, 1338-1348, Copyright © 1986 by Society for Neuroscience
Anatomical and physiological development of the Xenopus embryonic motor system in the absence of neural activity
LJ Haverkamp
Embryos of Xenopus laevis were continually immobilized by immersion in
solutions of either chloretone or lidocaine, from the late neural-fold
stage to the approximate time of hatching. Such treatment has been shown to
result in only transient quantitative effects on swimming behavior. Chronic
immobilization was without either immediate or long- term effect on the
ventral root output exhibited during "fictive" swimming episodes.
Development under these conditions of diminished or absent neural activity
similarly had no effects on a number of measures of the size and complexity
of motoneuron dendritic arborizations. These results support the premise
that the early development of specific neuronal morphology and connectivity
may be largely independent of functional activity.