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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク A delta fiber ： ウィキペディア英語版 A delta fiber An A delta fiber or Aδ fiber is a type of sensory nerve fiber. A delta fibers carry cold, pressure and some pain signals. Because A delta fibers are thinly myelinated, they send impulses faster than unmyelinated C fibers, but more slowly than other, more thickly myelinated "A" class fibers. The fibers terminate at Rexed laminae I and V.〔Basbaum et al. 2009. Cellular and Molecular Mechanisms of Pain. Cell 139. DOI 10.1016/j.cell.2009.09.028 - Available at http://ac.els-cdn.com/S0092867409012434/1-s2.0-S0092867409012434-main.pdf?_tid=1ad886f0258c3fb66e249ad7a37df3e2&acdnat=1337524198_340d33507bdc41242daa6a3a72b2cf0a〕 ==Structure== They are thin (2 to 5 μm in diameter), myelinated axons with a moderate conduction velocity, or speed of travel of a nerve signal (2 to 30 m/s). These nerve fibers are associated with acute (sharp) pain and therefore constitute the afferent portion of the reflex arc that results in "pulling away" from noxious stimuli (e.g. retracting your hand away from a hot stove). A certain proportion of Aδ fibers are also associated with sensations of temperature (also known as 'cold receptors' in mammals) and pressure. Slowly conducting, unmyelinated C fibers, by contrast, carry slow, burning pain. Like other sensory fibers, the Aδ fiber is an extension of a pseudounipolar neuron with its cell body located in a dorsal root ganglion or trigeminal ganglion. Within the spinal cord, afferent nociceptor fibers synapse at or near the spinal cord level where they enter. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「A delta fiber」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.