Abstract
The mode of branching of preterminal axons in the cat oculomotor nucleus was studied by electron microscopy. At many nodes of Ranvier, branching does not occur. At those nodes where branching does occur, trifurcations as well as bifurcations are present. Nodal synapses are common, and, in some cases, both pre- and postsynaptic processes are sorrounded by the myelin sheath. The data indicate that divergence of neural information may occur at trifurcations and higher-order branchings, as well as at bifurcations, and further demonstrate that divergence of neural information may occur at sites, i.e. nodal synapses, that are not discernible at the light microscopic level.
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