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Related Concept Videos

Brainstem01:19

Brainstem

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.
The Midbrain
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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The pontine REM switch: past and present.

Patrick M Fuller1, Clifford B Saper, Jun Lu

  • 1Department of Neurology, Division of Sleep Medicine, and Program in Neuroscience, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.

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|September 22, 2007
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Summary

Researchers propose a new model for rapid eye movement (REM) sleep regulation, identifying non-cholinergic, non-monoaminergic REM-on and REM-off neuronal circuits. This flip-flop switch model explains REM sleep generation and atonia.

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Area of Science:

  • Neuroscience
  • Sleep Science
  • Neurobiology

Background:

  • The established model for REM sleep regulation relies on reciprocal inhibition between monoaminergic and cholinergic neurons.
  • Pharmacological evidence supports this model, yet lesion studies show limited effects, creating a discrepancy.
  • Recent findings suggest alternative neural circuits may govern REM sleep.

Purpose of the Study:

  • To investigate novel neural circuitry involved in REM sleep regulation.
  • To propose an alternative model for REM sleep switching mechanisms.
  • To elucidate the neuroanatomical basis of REM sleep generation and atonia.

Main Methods:

  • Identification of non-cholinergic and non-monoaminergic neuronal populations in the mesopontine tegmentum.
  • Investigation of mutually inhibitory interactions between REM-on and REM-off areas.
  • Analysis of glutamatergic neuron projections regulating EEG activity and atonia.

Main Results:

  • Discovery of GABAergic REM-on neurons in the sublaterodorsal tegmental nucleus (SLD) and REM-off neurons in the ventrolateral periaqueductal grey matter (vlPAG) and lateral pontine tegmentum (LPT).
  • These neuronal populations form a flip-flop switch, regulating REM sleep states.
  • Independent glutamatergic pathways from REM-on areas control EEG components and atonia, explaining their dissociation in disorders.

Conclusions:

  • A new REM sleep switching circuitry model based on a flip-flop mechanism is proposed.
  • This model involves mutually inhibitory GABAergic REM-on and REM-off neuronal groups.
  • Independent pathways for EEG and atonia regulation offer insights into REM sleep disorders.