Norepinephrine, which is also known as noradrenaline, is released by the neurotransmitters of the autonomic nervous system by most of the postganglionic neurons. This transmission of synaptic activity is adrenergic. There are, however, instances of exception. The skeletal muscles are innervated by sympathetic neurons, some of which are likely to transmit acetylcholine, or cholinergic transmissions. This is particularly true when considering the sympathetic neurons which innervate the sweat glands.
All preganglionic neurons rely on acetylcholine for their transmission, regardless of whether they belong to the sympathetic or parasympathetic divisions. When postganglionic synaptic activity occurs with effector cells, acetylcholine is the transmission used as well. Diffusion and transmission at the autonomic ganglia
As well as at the synaptic activity of postganglionic neurons is then cholinergic. A cholinergic fiber in reality is a neuron which releases acetylcholine from the terminal point of the axon.
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