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Preganglionic fibers of the parasympathetic division of the ANS synapse with the?
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∙ 12y ago
Their corresponding Postganlionic fibres.
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∙ 12y ago
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Are nerve fibers in ascending tracts myelinated?
If I was paying attention in med school, I think... The pre-ganglionic fibers are myelinated and the post-ganglionic are unmyelinated. This is in reference to the sympathetic and parasympathetic systems.
Which division of the autonomic nervous system secretes acetylcholine via cholinergic nerve fibers?
Parasympathetic nervous system .
Do fibers of the optic nerve synapse at lateral genticulates of the thalamus?
It is a true statement that fibers of the optic nerve synapse at lateral genticulates of the thalamus.
What carries cardiac impulses to the myocardium?
Purkinje Fibers
Do the sympathetic fibers leave the CNS at the thoracolumbar region?
All preganglionic sympathetic fibers leave the CNS at the thoracolumbar region, yes.
Which division of the autonomic nervous system is characterized by short preganglionic and long postganglionic fibers?
The parasympathetic nervous system has long preganglionic and short postganglionic fibers
What does a pelvic splanchnic nerve contains?
Preganglionic parasympathetic fibers. In the Parasympathetic division, the preganglionic axons leave the ventral roots of the spinal cord and collectively form the pelvic splanchnic nerves.
A pelvic splanchnic nerve contains?
preganglionic parasympathetic fibers
What cranial nerves does not contain preganglionic parasympathetic fibers?
optic (II)
Which nerves contain the most parasympathetic preganglionic fibers?
ciliary, pterygopalatine, otic, and submandibular.
The site of origin of the preganglionic fibers of the parasympathetic nervous system is?
brain stem and the sacral region of the cord
What secretes norepinephrine adrenergic fibers?
sympathetic division. Parasympathetic division fibers called cholinergic fibers release acetylcholine.
Which nerves contain the most parasympathetic preganglionic fibers a trigeminal b splanchnic c optic d vagus?
D. vagus. this is the largest Cranial nerve, carrying parasympathetic information to much of the body (ie. esophagus, GI tract, heart). parasympathetic fibers, unlike sympathetic fibers, do not synapse until they are pretty much on in or near the organ. So the vagus is made up of preganglionic parasympathetics.trigeminal contains somatic afferents, and somatic efferents. neither of these are visceral efferents (which could be para or sympathetic).wikipedia tells you correctly that splanchnic nerves are generally sympathetic autonomics, except for one spot.optic nerve is carrying Afferent sensory information Away from the eye.
What is another name for parasympathetic?
The parasympathetic division is also called the craniosacral division because it arises from te brain and sacral region of the spinal cord; its fibers travel in certain cranial and sacral nerves. The parasympathetic division is also called the craniosacral division because it arises from te brain and sacral region of the spinal cord; its fibers travel in certain cranial and sacral nerves.
Does the gray rami communicans contain fibers of a preganglionic or postganglionic neurons?
could be preganglionic
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
Are nerve fibers in ascending tracts myelinated?
If I was paying attention in med school, I think... The pre-ganglionic fibers are myelinated and the post-ganglionic are unmyelinated. This is in reference to the sympathetic and parasympathetic systems.
