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Adrenergic nerve fibre
An adrenergic nerve fibre is a neuron for which the neurotransmitter is either adrenaline (epinephrine), noradrenaline or dopamine. These neurotransmitters are released at a location known as the synapse, which is a junction point between the axon of one nerve cell and the dendrite of another. The neurotransmitters are first released from the axon and then bind to the receptor site on the dendrite. Adrenergic nerve terminals are found in the secondary neurons of the sympathetic nervous system, one of two deviations of the autonomic nervous system which is responsible for your fight-or-flight response.〔(【引用サイトリンク】url=http://www.britannica.com/EBchecked/topic/6447/adrenergic-nerve-fibre )〕 This systems increases heart rate, slows digestion, dilates pupils, and also controls the secretion of apocrine sweat glands in the dermal layer of skin, in addition to other responses.〔Junqueira's Basic Histology : Text and Atlas,13th. ed,c2013〕
==Composition==
The nerve fibre is a thread-like extension of a nerve cell that includes the axon which may or may not be encased in a myelinated sheath. The androgenic nerve fibre when myelinated increases the speed of transmission for an action potential across the length of the cell. The gaps in the sheath along the axon are call the node of ranvier.
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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