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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.
The Midbrain
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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
The olivary nucleus, or inferior olivary nucleus, is located within the ventrolateral part of the medulla oblongata. It is primarily involved in motor coordination and motor learning. The olivary nucleus receives input from the spinal cord, cerebellum, and motor...
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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
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Indirect Motor Pathways01:22

Indirect Motor Pathways

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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
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Diencephalon: Thalamus and Information Relay01:27

Diencephalon: Thalamus and Information Relay

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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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Updated: Dec 7, 2025

Stereotaxic Surgical Approach to Microinject the Caudal Brainstem and Upper Cervical Spinal Cord via the Cisterna Magna in Mice
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Dissecting Brainstem Locomotor Circuits: Converging Evidence for Cuneiform Nucleus Stimulation.

Stephano J Chang1,2,3, Iahn Cajigas2,4, Ioan Opris2

  • 1Neuroscience Graduate Program, University of Miami Miller School of Medicine, Miami, FL, United States.

Frontiers in Systems Neuroscience
|September 25, 2020
PubMed
Summary
This summary is machine-generated.

Effective therapies are needed for freezing of gait. The cuneiform nucleus (CnF) may be a better deep brain stimulation target than the pedunculopontine nucleus (PPN) for neurological gait disorders.

Keywords:
cuneiform nucleusdeep brain stimulationgait dysfunctionmesencephalic locomotor regionpedunculopontine nucleus

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Area of Science:

  • Neuroscience
  • Neurology
  • Biomedical Engineering

Background:

  • Freezing of gait (FOG) and other neurological gait disorders present a significant unmet therapeutic need.
  • Deep brain stimulation (DBS) targeting the pedunculopontine nucleus (PPN), part of the mesencephalic locomotor region (MLR), was explored but yielded disappointing results.
  • This led to the abandonment of PPN DBS by many clinicians for FOG treatment.

Purpose of the Study:

  • To investigate the reasons behind the limited success of PPN DBS for FOG.
  • To propose the cuneiform nucleus (CnF) as a potentially superior midbrain target for DBS in neurological gait disorders.
  • To review existing clinical data and preclinical evidence supporting CnF as an alternative target.

Main Methods:

  • Review of clinical trial data for PPN DBS in FOG.
  • Analysis of preclinical optogenetics studies investigating locomotor control.
  • Comparative assessment of PPN and CnF roles in gait regulation.

Main Results:

  • Identified potential shortcomings in previous PPN DBS approaches.
  • Preclinical evidence suggests the cuneiform nucleus (CnF) plays a crucial role in initiating and maintaining locomotion.
  • CnF stimulation may offer a more effective therapeutic strategy for FOG compared to PPN.

Conclusions:

  • The failure of PPN DBS highlights the complexity of targeting FOG.
  • The cuneiform nucleus (CnF) emerges as a promising alternative target for DBS in treating neurological gait disorders.
  • Further research and clinical trials are warranted to validate CnF as a superior therapeutic target.