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Thoracic and lumbar regions
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoyes
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Where do sympathetic fibers originate?
The sympathetic motor neurons come from the thoracic through the lumbar region of the spinal cord.
From what areas of the CNS does each division originate?
The parasympathetic originates from the brain and spinal cord. The sympathetic originates from the thoracic and lumbar spinal nerves.
Do the white communicating rami contain myelinated preganglionic sympathetic nerve fibers and are present in all apinal nerves?
Yes and No. White communicating rami contain mylinated preganglionic sympathetic nerve fibers, but are only present at the levels of spinal cord segments T1-L2 (where the cell bodies for these nerve fibers exist in the lateral horn of the spinal cord). Although the sympathetic fibers only arise in the T1-L2 spinal cord segments, they are dispersed to all spinal nerves by traveling through the sympathetic chain. The preganglionic sympathetic fibers will enter the sympathetic chain thru whit rami communicans and then do one of 4 things: 1. synapse with a postganglionic cell body in the sympathetic chain at the level it enters 2. ascend within the chain to synapse 3. descend within the chain to synapse 4. splanchnic nerves leave the chain without synapsing and synapse closer to the organ they innervate.There are, however, GRAY rami communicans for all spinal nerves.I hope that helps
What path is taken by the sympathetic fibers of autonomic nervous system?
They are referred to as thoracolumbar outflow and run parallel to the spinal cord in a series on connected ganglion.
What spinal cord location would you find the origin of the white rami communicantes.?
The white rami communicantes are myelinated pre-ganglionic fibers (myelinated axons) from cell bodies located in the internal gray of the spinal cord. These fibers represent general visceral efferents of the sympathetic nervous system.
What is the location of sympathetic nervous system?
the spinal cord
Does the spinal cord have a backbone?
The spinal cord is a bundle of nerve fibers which is inside of the vertebrae (backbones).
The gray matter of the spinal cord?
Is located within the spinal cord and contains unmyelinated fibers.
Where does the gracile fasciculus originate from?
spinal cord
The anterior root of the spinal cord is composed of?
motor fibers
Does the white rami communicans contain fibers of a preganglionic or postganglionic neurons?
Preganglionic because they are myelinated. FALSE
What fibers do ventral spinal cord roots contain?
The ventral roots contain motor fibers.
