Autonomic Ganglia
Autonomic Ganglia - Related Videos
01:23
Drugs Acting on Autonomic Ganglia: Stimulants
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2023
Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating sympathetic or...
01:28
Drugs Acting on Autonomic Ganglia: Blockers
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2023
Ganglionic blockers inhibit autonomic activity by blocking nicotinic receptors in the autonomic ganglia, suppressing impulse transmission. These blockers lack selectivity between sympathetic and parasympathetic ganglia and are ineffective as neuromuscular junction antagonists. They can be categorized into two groups: Prototype Nicotine: These agents stimulate ganglia through acetylcholine-like action, leading to consistent depolarization and subsequent ganglionic blockade. Competitive...
09:48
Dissection of Pelvic Autonomic Ganglia and Associated Nerves in Male and Female Rats
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Cited by 9 •
2020
The major pelvic ganglia contain parasympathetic and sympathetic neurons that innervate pelvic organs. Here we describe a dissection method and provide schematics for identification of these ganglia and their associated nerves. These methods can be applied to experimental manipulation of these ganglia in vivo or removal post-mortem for further study.
11:40
Quantitative Autonomic Testing
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Cited by 179 •
2011
Standardized, comprehensive and fully quantitative testing of autonomic functions is described. The autonomic tests consist of evaluation of all three major autonomic domains including cardiovagal, adrenergic and sudomotor. The severity and distribution of dysautonomia is quantitated using Composite Autonomic Severity Scores.
04:01
Isolation of Cells from Sensory Ganglia
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2025
This video demonstrates the isolation of cells from the sensory ganglia of mice. Ganglia are subjected to enzymatic digestion to dissolve the extracellular matrix. Single cells are then collected via filtering through a cell strainer followed by density gradient centrifugation for debris removal. Finally, washing and centrifugation are done to collect the isolated cells for future analysis.
FAQs
Transmission follows a two-neuron sequence. A preganglionic neuron releases acetylcholine within the ganglion, where it activates nicotinic receptors on a postganglionic neuron. The postganglionic cell then carries the signal onward to smooth muscle, cardiac muscle, or glands. This arrangement creates an intermediate signaling point between the central nervous system and peripheral organs.
Acetylcholine provides the chemical signal released by preganglionic neurons, while nicotinic receptors detect that signal on postganglionic neurons. Their interaction enables communication across the ganglion before the message reaches an involuntary organ. Because this step is shared by sympathetic and parasympathetic pathways, it is important for understanding how autonomic signals are relayed and regulated.
Sympathetic and parasympathetic ganglia participate in pathways that regulate organs such as the heart, blood vessels, smooth muscle, and glands. Enteric ganglia have a specialized role in coordinating gastrointestinal activity. Comparing these systems shows how related neural arrangements support different aspects of homeostasis, from cardiovascular control to digestive function, within the peripheral nervous system.
The relay provides an organized point where signals are passed from preganglionic to postganglionic neurons before reaching target tissues. Through this arrangement, autonomic pathways can influence cardiac muscle, smooth muscle, and glands. Studying the relay helps connect neural signaling with outcomes such as heart-rate regulation, blood-pressure control, and coordinated gastrointestinal activity.
Researchers can use ganglion organization and signaling to investigate how the nervous system regulates involuntary organs and maintains homeostasis. Examining the sequence from preganglionic neurons through postganglionic neurons to target tissues helps relate cellular communication to physiological outcomes. This perspective is relevant to studies of cardiovascular function, digestion, gland activity, and broader autonomic control.
These structures provide a framework for examining how altered autonomic signaling may affect involuntary organ control. Their relay mechanisms are also relevant to pharmacology because acetylcholine and nicotinic receptors participate in communication within the pathways. In developmental research, ganglion organization offers context for understanding how peripheral neural circuits are arranged to regulate homeostatic functions.