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A pre-ganglionic lesion refers to damage occurring before a nerve synapses at a ganglion, affecting the axon of a neuron that transmits signals from the central nervous system to the peripheral nervous system. This type of lesion can disrupt the transmission of nerve impulses, leading to loss of function or paralysis in the affected area. It is often associated with conditions affecting the spinal cord or nerve roots. Diagnosis and treatment typically focus on addressing the underlying cause of the lesion.
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Does the gray rami communicans contain fibers of a preganglionic or postganglionic neurons?
could be preganglionic
What synapses release acetylcholine?
sympathetic preganglionic axon parasympathetic preganglionic axon parasympathetic postganglionic axon
What does preganglionic sympathetic Stimulation produce?
ACH
Does the white rami communicans contain fibers of a preganglionic or postganglionic neurons?
Preganglionic because they are myelinated. FALSE
What fibers are located in the white rami?
Sympathetic preganglionic.
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
Which spinal region lacks autonomic preganglionic neurons?
The thoracic region of the spinal cord lacks autonomic preganglionic neurons. Autonomic preganglionic neurons are found in the intermediolateral cell columns of the spinal cord at the thoracolumbar (T1-L2) and sacral (S2-S4) levels.
Which lesion in a coronary artery do physicians normally consider higher risk proximal lesion or distal lesion?
Proximal lesion
Is The neurotransmitter released by both sympathetic and parasympathetic preganglionic neurons is acetylcholine.?
Yes, the neurotransmitter released by both sympathetic and parasympathetic preganglionic neurons is acetylcholine. In the autonomic nervous system, preganglionic neurons from both divisions release acetylcholine to activate nicotinic receptors on postganglionic neurons. This is a key feature that differentiates the preganglionic fibers from the postganglionic fibers, where the sympathetic fibers typically release norepinephrine and the parasympathetic fibers release acetylcholine.
Are preganglionic neurons made up of adrenergic fibers?
yes
Which division of the nervous system has short preganglionic neurons?
sympathetic
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.
