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Related Concept Videos

Cranial Part of Parasympathetic Division01:18

Cranial Part of Parasympathetic Division

The cranial part of the parasympathetic division plays a crucial role in regulating the visceral functions of the head and specific structures in the neck, thoracic, and abdominopelvic cavities. Preganglionic fibers of the parasympathetic division exit the brain through cranial nerves III (oculomotor), VII (facial), IX (glossopharyngeal), and X (vagus), delivering parasympathetic output to the respective visceral structures.
The vagus nerve (cranial nerve X) alone accounts for approximately 75...
Esophageal Achalasia01:27

Esophageal Achalasia

Esophageal achalasia is a chronic neurogenic disorder characterized by impaired relaxation of the lower esophageal sphincter (LES) and absent or ineffective peristalsis in the distal esophagus. This leads to a functional obstruction without a physical blockage, despite significant disruption of esophageal motility.EtiologyAchalasia is caused by degeneration of the myenteric (Auerbach's) plexus, specifically the loss of inhibitory ganglion cells that produce vasoactive intestinal peptide (VIP)...
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...
Drugs Acting on Autonomic Ganglia: Blockers01:28

Drugs Acting on Autonomic Ganglia: Blockers

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:
Vascular Spasm01:16

Vascular Spasm

The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
Esophageal Varices-I: Introduction01:24

Esophageal Varices-I: Introduction

Esophageal varices are dilated, tortuous veins which are found mainly in the submucosa of the lower esophagus but which may also appear higher up or extend into the stomach. They develop due to increased pressure in the portal venous system, often as a result of liver cirrhosis. This condition scars and damages the liver, impeding normal blood flow through the portal vein. To compensate, blood seeks alternative pathways, forming fragile new vessels (varices) in the esophagus and stomach. These...

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Related Experiment Video

Updated: Jul 17, 2026

A Unified Methodological Framework for Vestibular Schwannoma Research
08:43

A Unified Methodological Framework for Vestibular Schwannoma Research

Published on: June 20, 2017

Vagal paraganglioma.

Elisabetta Zanoletti1, Antonio Mazzoni

  • 1ENT Unit, Department of Neurological and Neurosurgical Sciences, Ospedali Riuniti, Bergamo, Italy.

Skull Base : Official Journal of North American Skull Base Society ... [Et Al.]
|February 3, 2007
PubMed
Summary

Surgical resection of vagal paragangliomas using a cervicoparotid approach can be effective, but often results in vagal palsy and other cranial nerve deficits. Careful consideration of tumor progression is crucial before surgery.

Area of Science:

  • Neurosurgery
  • Head and Neck Surgery
  • Oncology

Background:

  • Vagal paragangliomas are rare neuroendocrine tumors arising from the vagus nerve.
  • Surgical management presents challenges due to the proximity of critical neurovascular structures.

Purpose of the Study:

  • To evaluate the outcomes of surgical treatment for vagal paragangliomas.
  • To establish a management protocol for these tumors.

Main Methods:

  • Retrospective case series of 16 consecutive patients.
  • Surgical resection via a cervicoparotid approach with pericapsular dissection.
  • Microsurgical techniques were employed between 1990 and 2003.

Main Results:

  • All patients experienced vagal palsy (vagus nerve dysfunction).

Related Experiment Videos

Last Updated: Jul 17, 2026

A Unified Methodological Framework for Vestibular Schwannoma Research
08:43

A Unified Methodological Framework for Vestibular Schwannoma Research

Published on: June 20, 2017

  • Eight patients sustained additional cranial nerve deficits.
  • No surgical mortality or disease-related deaths occurred.
  • Conclusions:

    • The described cervicoparotid approach provides adequate exposure for safe vagal tumor removal.
    • Preoperative assessment of tumor natural history is vital, especially for multifocal disease.
    • Management decisions should weigh surgical risks against tumor progression.