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general visceral afferent fibers
The general visceral afferent fibers (GVA) conduct sensory impulses (usually pain or reflex sensations) from the viscera, glands, and blood vessels to the central nervous system. They are considered to be part of the visceral nervous system, not the autonomic nervous system. However, unlike the efferent fibers of the autonomic nervous system, the afferent fibers are not classified as either sympathetic or parasympathetic.
GVA create referred pain by activating general somatic afferent fibers where the two meet in the posterior horn of the spinal cord (dorsal horn).
The cranial nerves that contain GVA fibers include the facial nerve, the glossopharyngeal nerve and the vagus nerve.〔Mehta, Samir et al. Step-Up: A High-Yield, Systems-Based Review for the USMLE Step 1. Baltimore, MD: LWW, 2003.〕
== Pathway ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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