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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