Ultrastructural dimensions of myelinated peripheral nerve fibres in the cat and their relation to conduction velocity

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Abstract
The ultrastructure of all the afferent fibers, or all the efferent fibers, was studied in selected nerves from chronically de-afferentated or de-efferentated cat hind limbs to determine the structural differences between fibers of different function groups. The following parameters were measured for each fiber: number of lamellae in the myelin sheath (n), axon perimeter (s), external fiber perimeter (S) and axon cross-sectional area (A). Fibers were allocated to afferent groups I, II, III or efferent groups .alpha. and .gamma. according to the number of lamellae in the myelin sheath.