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Related Concept Videos

Cranial Nerves: Types Part I01:14

Cranial Nerves: Types Part I

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Cranial nerves are responsible for transmitting motor and sensory information between the brain and various parts of the body. There are twelve pairs of cranial nerves, with the first six being essential in sensory perception, motor control, and autonomic functions related to the head and neck.
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Cranial Part of Parasympathetic Division01:18

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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.
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Sympathetic Pathways: Sympathetic Chain Ganglia01:20

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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...
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Cranial Nerves: Types Part II01:22

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Cranial nerves are responsible for transmitting motor and sensory information between the brain and various parts of the body. There are twelve pairs of cranial nerves. While the first six innervate the head and neck, the latter six nerves innervate the head and neck, as well as organs and tissues in the thoracic and abdominal cavities. They facilitate communication, expression, and autonomic control within the human body.
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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Cranial Nerves: Overview and Anatomy01:19

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The cranial nerves are an important part of the complex network of nerves in the human body. These nerves emerge directly from the brain and are responsible for transmitting essential information between the brain and various parts of the head and neck. There are 12 pairs of cranial nerves, systematically numbered using Roman numerals from I to XII, beginning from the anterior and moving to the posterior of the brain. Each cranial nerve is uniquely identified by names that reflect its function...
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Related Experiment Video

Updated: Jan 18, 2026

Subcutaneous Trigeminal Nerve Field Stimulation for Refractory Facial Pain
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Trigeminal Autonomic Cephalalgias.

Mark J Burish1, Todd D Rozen2

  • 1Department of Neurosurgery, University of Texas Health Science Center at Houston, Will Erwin Headache Research Center, 6400 Fannin Street, Suite 2010, Houston, TX 77030, USA.

Neurologic Clinics
|September 30, 2019
PubMed
Summary

Trigeminal autonomic cephalalgias (TACs) involve unilateral headaches with autonomic symptoms. Understanding their unique pathophysiology and diagnostic criteria is key to effective, individualized treatment for these debilitating headache disorders.

Keywords:
Cluster headacheHemicrania continuaParoxysmal hemicraniaSUNASUNCTTrigeminal autonomic cephalalgia

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Area of Science:

  • Neurology
  • Headache Medicine

Background:

  • Trigeminal autonomic cephalalgias (TACs) are primary headache syndromes.
  • Characterized by unilateral headache and ipsilateral cranial autonomic features.

Purpose of the Study:

  • To review the pathophysiology, diagnosis, and treatment of TACs.
  • To provide an in-depth discussion of each TAC's unique therapeutic approach.

Main Methods:

  • Literature review of TACs.
  • Analysis of diagnostic criteria including frequency, duration, and symptoms.
  • Discussion of treatment strategies for individual TACs.

Main Results:

  • TACs encompass cluster headache, paroxysmal hemicrania, short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing, and hemicrania continua.
  • Pathophysiology involves the trigeminal pain system, autonomic system, hypothalamus, and vagus nerve.

Conclusions:

  • Accurate diagnosis of TACs relies on specific headache characteristics.
  • Tailored treatment is essential for managing each distinct TAC effectively.