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Table 1 Characterization of vagus nerve fibers.

From: Overview of therapeutic applications of non-invasive vagus nerve stimulation: a motivation for novel treatments for systemic lupus erythematosus

Type of fiber Size (diameter) Myelinated velocity range (ms) Transmitted information
A-fiber Large (5-20 μm) Yes >4.5 Afferent visceral information and efferent motor signals
B-fiber Mid-size (1-3 μm) Yes 2-4.5 Most of the efferent parasympathetic signals
C-fiber Small (0.4-2 μm) Yes <2 Mainly afferent visceral information