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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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The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
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The medulla oblongata is a crucial part of the brainstem responsible for controlling various autonomic and involuntary functions. It contains several nuclei, including the olivary, cuneate, gracile, and solitary nuclei.
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Diencephalon: Anatomical Regions01:30

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The diencephalon, etymologically translated as 'through brain,' plays an integral role as the conduit between the cerebrum and the vast extent of the nervous system. However, the olfactory system is an exception, as it interfaces directly with the cerebrum. The diencephalon, deeply ensconced beneath the cerebrum, primarily consists of three paired structures — the thalamus, hypothalamus, and epithelamus. It also includes accessory structures such as the subthalamus, which houses the...
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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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Related Experiment Video

Updated: Mar 27, 2026

Author Spotlight: Exploring Peripheral Mechanisms of Neuropathic Pain in Trigeminal Nerve Injury
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The mesencephalic trigeminal neuron: electrophysiological insights into function and dysfunction.

Soju Seki1, Akifumi Enomoto2, Susumu Tanaka1

  • 1Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, The University of Osaka, Suita, Osaka, Japan.

Frontiers in Cellular Neuroscience
|March 26, 2026
PubMed
Summary

Mesencephalic trigeminal neurons (MTNs) control jaw movements. Dysfunction in these neurons contributes to bruxism and other disorders, but they also offer novel therapeutic targets for neurological conditions.

Keywords:
MTNsVMEselectrophysiologymesencephalic trigeminal neuronpatch clampprimary afferent neuronsproprioceptionvoltage-dependent sodium channel

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Motor Control

Background:

  • Mesencephalic trigeminal neurons (MTNs) are unique primary afferents with central cell bodies.
  • They regulate masticatory muscle proprioception and jaw-oral motor functions.

Purpose of the Study:

  • To review the ionic mechanisms, neurotransmitter modulation, and pathological roles of MTNs.
  • To highlight MTNs as therapeutic targets for masticatory and neurodegenerative disorders.

Main Methods:

  • Review of existing literature on MTN physiology and pathology.
  • Analysis of ionic currents (Nav1.6), neurotransmitter effects (serotonin, norepinephrine), and molecular changes (Piezo2).

Main Results:

  • MTNs utilize specific ionic currents for sustained and burst firing, crucial for masticatory rhythm.
  • Dysfunctions in MTNs are linked to bruxism, temporomandibular disorders, and neurodegenerative diseases.
  • Aging and tooth loss negatively impact MTN function and survival.

Conclusions:

  • MTNs are critical for jaw-oral motor control and sensorimotor integration.
  • Therapeutic strategies targeting MTNs show promise for various neurological and motor disorders.