What are preganglionic fibers and postganglionic fibers?
Visceral nerve from the lower central needs to arrive after two neurons innervated organs (adrenal medulla exception as long as one), the first neurons called preganglionic neurons, the cell body is located in the brainstem and spinal cord, the axons called preganglionic fibers of second neurons called postganglionic nerve yuan cell bodies located around the Department of autonomic ganglia. The axons called postganglionic fibers. Postganglionic neurons are numerous, and a preganglionic neuron can form synapses with a number of postganglionic neurons
The fibers of the lower center of the motor nerve, called preganglionic fibers.The axon of the autonomic nerve postganglionic neuron, called the postganglionic fiber, is located at the periphery of the autonomic nerve.
The first known preganglionic neuron neurons of preganglionic neurons, cell bodies located in the brainstem and spinal cord axons, the preganglionic fibers preganglionic fiber. said second neurons called postganglionic neurons postganglionic neuron cell bodies were located in the plant of the peripheral ganglia, said postganglionic fiber. whose axons postganglionic postganglionic neurons of a large number of preganglionic neurons and can a form of postganglionic neurons synapse.
The visceral motor nerve needs 2 neurons from the lower central organs, and the second neurons are called postganglionic neurons, and their soma is located in the visceral motor ganglia. The somatic motor nerve has only one neuron from the inferior center to the skeletal muscle. The visceral motor nerve is switched from the lower central nervous system to the inner splanchnic motor ganglia (vegetative ganglia) of the periphery, and the nerve fibers are then sent out by the ganglionic neurons. Thus, the visceral motor nerve, from the lower central reach the organ to which it passes, must pass through two neurons (the exception of the adrenal medulla, with only one neuron).
Preganglionic fiber preganglionic fiber line terminates in synaptic nerve fibers in the ganglion. The fibers that stick out from the ganglion are called postganglionic fibers. In the autonomic nervous system, the former is mostly myelinated and the latter is unmyelinated. The terminal branch of preganglionic fibers and synaptic connections of most of the cell bodies of postganglionic fibers, a postganglionic fiber that receives many branches of preganglionic fibers. Almost all of the sympathetic nervous system to postganglionic noradrenergic, all sympathetic and parasympathetic preganglionic fibers and motor nerve, all postganglionic parasympathetic fibers, few sympathetic postganglionic fibers for cholinergic nerve.
