Constancy of motor axon conduction time during growth in rats.

TitleConstancy of motor axon conduction time during growth in rats.
Publication TypeJournal Article
Year of Publication1992
AuthorsChen, XY, Carp, JS, Wolpaw, J
JournalExperimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale
Date Published08/1992
Keywordsdevelopment, motoneuron, motor axon, nerve conduction, rat

Axon conduction distance, conduction velocity, and conduction time were measured for individual triceps surae motoneurons in Sprague-Dawley rats weighing 230-630 g (i.e., age range 6-16 weeks). Both conduction distance (nerve length) and velocity were closely correlated with weight (r = 0.95 and r = 0.82, respectively). In contrast, conduction time did not change as weight increased nearly threefold. This striking constancy is probably due to a corresponding increase in axon diameter. It could contribute to maintenance of stable motor performance during rapid growth.


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