Abstract
The nerve supply to the stapedius muscle of the cat was evaluated with regard to the number and diameters of the myelinated fibers and the number of unmyelinated fibers. An average of 1054 myelinated fibers and 7272 unmyelinated fibers were found. The diameters of the myelinated fibers were from less than 1 μm to 10 μm with the peak between 3 and 4 μm. Studies of Wallerian degeneration after intracranial transection of the VII and VIII cranial nerves indicated that 84% of the myelinated fibers were motor and 16% were sensory. There was no significant change in the number of unmyelinated fibers after transection.
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