POSTGANGLIONIC SYMPATHETIC FIBER Meaning and
Definition
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A postganglionic sympathetic fiber is a type of nerve fiber that originates from a ganglion in the sympathetic division of the autonomic nervous system. It is responsible for transmitting signals from the ganglion to the target organ or tissue, thereby mediating sympathetic responses throughout the body.
The term "postganglionic" refers to the location of the nerve fiber, which is situated distal to or beyond the ganglion. Ganglia are clusters of nerve cell bodies that are present outside the central nervous system, and in the sympathetic division, they are located along the pathway of the sympathetic chain. These ganglia serve as relay points for nerve impulses as they travel from the spinal cord to their final destination.
The postganglionic sympathetic fibers play a crucial role in maintaining various physiological functions such as regulation of heart rate, blood pressure, and breathing rate, as well as controlling the body's response to stress. These fibers release neurotransmitters, primarily norepinephrine, which bind to specific receptors on target cells, inducing various responses depending on the type of tissue involved.
Due to their involvement in the sympathetic division, disruptions or dysfunctions of postganglionic sympathetic fibers can lead to a range of medical conditions, including hypertension, cardiovascular disorders, and disorders of thermoregulation. Various therapeutic interventions targeting these fibers aim to modulate their activity and restore the balance of sympathetic responses in the body.
Common Misspellings for POSTGANGLIONIC SYMPATHETIC FIBER
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- posgganglionic sympathetic fiber
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