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Related Concept Videos

Sympathetic Pathways: Sympathetic Chain Ganglia01:20

Sympathetic Pathways: Sympathetic Chain Ganglia

The sympathetic chain ganglia, also known as the sympathetic trunk ganglia or paravertebral ganglia, are a series of ganglia located bilaterally on either side of the spinal column. These ganglia serve as relay stations for the sympathetic nervous system. Preganglionic neurons originating in the spinal cord project their axons to the sympathetic chain ganglia. Within the ganglia, these preganglionic fibers synapse with postganglionic neurons.The postganglionic neurons of the sympathetic trunk...
Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla01:27

Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla

The sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response.
Collateral Ganglia
Sympathetic preganglionic axons reach the collateral ganglia along the route of splanchnic nerves. These nerves bypass the sympathetic trunk and communicate with sympathetic postganglionic neurons housed in the prevertebral ganglia. These ganglia supply the organs of the abdominopelvic cavity.
The greater splanchnic nerve, formed by the...
Neuromuscular Junction And Blockade01:29

Neuromuscular Junction And Blockade

The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
Sympathetic Signaling01:31

Sympathetic Signaling

Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...
Peripheral Nervous System: Ganglia and Nerves01:24

Peripheral Nervous System: Ganglia and Nerves

The Peripheral Nervous System (PNS) is a crucial component of the body's neural network, extending beyond the central nervous system (CNS) to bridge the gap between the CNS and the external environment. It encompasses nerves, ganglia, and sensory receptors.
Nerves
The nerve is a bundle of axons that serves as the communication highway in the PNS. Each nerve is ensheathed in a protective layer of connective tissue called the epineurium. This outermost layer safeguards the nerve and supports the...
Integration of Synaptic Events01:28

Integration of Synaptic Events

Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...

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Related Experiment Video

Updated: Jun 20, 2026

Implementing Dynamic Clamp with Synaptic and Artificial Conductances in Mouse Retinal Ganglion Cells
11:46

Implementing Dynamic Clamp with Synaptic and Artificial Conductances in Mouse Retinal Ganglion Cells

Published on: May 16, 2013

Dynamic Clamp Analysis of Synaptic Integration in Sympathetic Ganglia.

J P Horn1, P H M Kullmann

  • 1University of Pittsburgh School of Medicine, Pittsburgh, USA.

Neirofiziologiia = Neurophysiology
|September 17, 2009
PubMed
Summary
This summary is machine-generated.

Sympathetic ganglia amplify neural activity through synaptic organization, with gain modulated by metabotropic signaling. This synaptic gain aids in controlling autonomic behaviors like blood pressure.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Synaptic Physiology

Background:

  • Modern neuroscience necessitates linking molecular mechanisms to systems and behavior.
  • Understanding synaptic organization in sympathetic ganglia is key to explaining autonomic functions.
  • Metabotropic signaling roles in modulating neural circuit gain require further investigation.

Purpose of the Study:

  • To investigate how sympathetic ganglia function as use-dependent amplifiers of preganglionic activity.
  • To determine how metabotropic signaling mechanisms modulate the gain of this amplification.
  • To connect ganglionic integration principles to autonomic behaviors, specifically blood pressure control.

Main Methods:

  • Developed a general computational model of ganglionic integration.
  • Employed the dynamic clamp method with intracellular recordings from bullfrog sympathetic neurons.
  • Mimicked physiological nicotinic and muscarinic synapses using virtual computer-generated synapses.

Main Results:

  • Analyzed synaptic gain by recording cellular responses to complex synaptic activity patterns.
  • Demonstrated that ganglionic integration generates gain in sympathetic neurons.
  • Showed that this gain is modulated by metabotropic signaling mechanisms.

Conclusions:

  • Synaptic organization in sympathetic ganglia enables use-dependent amplification of neural activity.
  • Modulation of amplification gain by metabotropic signaling is crucial for neural circuit function.
  • Ganglionic integration-generated gain contributes to feedback control of autonomic behaviors, including blood pressure regulation.