NATURE AND SOURCE OF FIBERS CONTRIBUTING TO THE SAPHENOUS NERVE OF THE CAT

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Abstract
The sources of fibers which contribute to the saphenous nerve of the cat were eliminated singly or conjointly. After allowing a sufficient time for Wallerian degeneration, the saphenous nerves were removed and studied by physiologic and histologic methods. The saphenous nerve fibers of the cat are essentially of 3 types, large thickly myelinated, smaller, more thinly myelinated and non-myelinated. The myelinated fibers have somatic properties and all have their cells of origin in the dorsal root ganglia. The non-myelinated fibers are derived from 2 sources, 80-90% from dorsal root ganglion cells, the remainder from cells in the sympathetic chain. The properties of the non-myelinated fibers of dorsal root origin are in every way similar to the properties of the non-myelinated fibers of sympathetic origin and strikingly dis tinct, therefore, from the properties of the somatic myelinated fibers. No evidence of synapsis in the dorsal root ganglia has been obtained.

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