Quantitative studies of the greater petrosal nerve of the mouse with the electron microscope

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Abstract
Quantitative counts of the greater petrosal nerve fibers of the mouse with the electron microscope have shown that, on an average, 70.8% and 28.7% of the total nerve fibers (1,111) were unmyelinated and myelinated fibers respectively. Unexpected high incidence of unmyelinated fibers in the greater petrosal nerve may indicate that it contains a fair amount of sympathetic post‐ganglionic fibers. The unmyelinated fibers in the nerve may well represent parasympathetic preganglionic fibers.