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Related Concept Videos

Brainstem01:19

Brainstem

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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 midbrain is located beneath the diencephalon and connects the cerebrum with the lower parts of the brain. The cerebral peduncles are prominent midbrain structures that house the...
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Brainstem: Control Centers of Medulla01:21

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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.
Olivary Nucleus
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Cranial Nerves: Overview and Anatomy01:19

Cranial Nerves: Overview and Anatomy

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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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Cerebellum: Anatomical Regions01:17

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The cerebellum, also known as the "little brain," is located in the posterior cranial fossa, inferior to the tentorium cerebelli and dorsal to the brainstem. It plays a significant role in motor control, coordination, and proprioception.
Cerebellar Structure
Externally, the cerebellum features a highly convoluted surface with numerous folia (narrow ridges) separated by shallow sulci (grooves). The cerebellum is divided into two hemispheres by a thin median structure known as the vermis. The...
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Cranial Nerves: Types Part II01:22

Cranial Nerves: Types Part II

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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.
Facial Nerve (Cranial Nerve VII)
Cranial nerve VII, or the facial nerve,...
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Arteries of the Head and Neck01:26

Arteries of the Head and Neck

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The human body's intricate network of arteries ensures that every organ system receives the necessary oxygen and nutrients for optimal function. The arterial network in the head and neck region is particularly complex, providing vital blood flow to the brain, eyes, and other critical structures. Prominent arteries in this region include the internal carotid arteries and the vertebral arteries.
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Functional brainstem representations of the human trigeminal cervical complex.

Jan Mehnert1, Hauke Basedau1, Lisa-Marie Sturm1

  • 1Department of Systems Neuroscience, University Medical Center Eppendorf, Hamburg, Germany.

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Summary

This study maps the brain

Keywords:
Brainstemgreater occipital nerverostral versus caudal representationsomatotopytrigeminal branches

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Area of Science:

  • Neuroscience
  • Human functional neuroimaging
  • Somatosensory research

Background:

  • The functional somatotopy of trigeminal (V1, V2, V3) and greater occipital nerves in the human brainstem, thalamus, and insula is not well understood.
  • Understanding these neural pathways is crucial for investigating pain mechanisms and developing targeted therapies.

Purpose of the Study:

  • To non-invasively map the functional representations of the trigeminal nerve branches and the greater occipital nerve in the human brain using high-resolution functional magnetic resonance imaging (fMRI).
  • To elucidate the somatotopic organization and potential interconnections within the trigemino-cervical complex.

Main Methods:

  • Utilized high-resolution fMRI in 87 healthy participants undergoing painful electrical stimulation of the trigeminal nerve branches (V1, V2, V3) and the greater occipital nerve.
  • Employed optimized imaging protocols for the lower brainstem and upper spinal cord to detect activation of the spinal trigeminal nuclei.
  • Stimulation involved four electrodes, randomized sites, repeated trials across three sessions for robust data acquisition (clinicaltrials.gov: NCT03999060).

Main Results:

  • Demonstrated a significant overlap between peripheral dermatomes and brainstem representations.
  • Revealed a somatotopic arrangement of trigeminal nerve branches along the perioral-periauricular axis.
  • Identified the greater occipital nerve representation in the brainstem below the pons, and also in the thalamus, insula, and cerebellum, with co-localization with V1 in the lower brainstem.

Conclusions:

  • Provided anatomical evidence for a functional inter-inhibitory network between the trigeminal branches and the greater occipital nerve in humans.
  • Showcased that functional trigeminal representations intermingle facial dermatomes in an 'onion-shaped' manner, overlapping in a somatotopic arrangement.
  • Findings have implications for understanding headache mechanisms and the efficacy of nerve blocks.