Postganglionic fiber

Japanese: 節後繊維 - せつごせんい（英語表記）postganglionic fiber

The postganglionic neuron processes (axons) in the autonomic nervous system and the membrane structure that surrounds them are collectively called postganglionic fibers. Postganglionic fibers are often unmyelinated. Postganglionic fibers in the sympathetic nervous system generally run longer than those in the parasympathetic nervous system, passing through the spinal nerves to the arrector pili muscles and sweat glands in the skin of the entire body, or passing through the arterial walls to the various internal organs of the body. Norepinephrine is released as a neurotransmitter from the terminals of sympathetic postganglionic fibers, and acetylcholine is released from the terminals of parasympathetic postganglionic fibers.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

自律神経系における節後ニューロン突起(軸索)とこれを包む被膜構造を合わせ，節後繊維という。節後繊維は無髄性であることが多いとされる。交感神経系の節後繊維は，副交感神経系のそれよりも一般に長い走行路をとり，脊髄神経内を通り全身皮膚の立毛筋や汗腺に至るか，あるいは動脈壁を通り全身の諸内臓に分布する。交感神経系節後繊維の末端からはノルアドレナリンが，副交感神経系節後繊維の末端からはアセチルコリンが，それぞれ神経伝達物質として放出される。

出典　株式会社平凡社世界大百科事典第２版について　情報

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