Abstract
Effects of the complete removal of the superior oblique muscle on the development of the trochlear nerve were studied by electron microscopy in white Peking duck embryos. Peripherally deprived nerves failed to show any evidence of branching, as did nerves taken from embryos whose neuromuscular transmission had been blocked with α-BTX. Our observations indicate that nerve branching may depend on a factor from the target tissue whose release or effectiveness is regulated by muscle activity. The possibility of a peripheral role in myelination of developing nerve fibers is also discussed.
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