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Related Concept Videos

Neural Circuits01:25

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Indirect Motor Pathways01:22

Indirect Motor Pathways

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.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
Diencephalon: Thalamus and Information Relay01:27

Diencephalon: Thalamus and Information Relay

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 states or needs.
Direct Motor Pathways01:11

Direct Motor Pathways

The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and the...
Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...

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Related Experiment Video

Updated: Jun 30, 2026

Understanding Cerebellar Pattern Formation
13:18

Understanding Cerebellar Pattern Formation

Published on: November 1, 2007

Competitive Olivocerebellar Input Selection Promotes Resilient Circuit Formation.

Jonathan A Coello1, Kristen M Crane1,2, Alyssa M Lyon1,3

  • 1Fralin Biomedical Research Institute, Virginia Tech Carilion.

Biorxiv : the Preprint Server for Biology
|June 29, 2026
PubMed
Summary

Neurotransmission competition shapes resilient neural circuits. Even with compromised inputs, motor control and social behaviors are maintained, demonstrating functional resilience in the cerebellum.

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Last Updated: Jun 30, 2026

Understanding Cerebellar Pattern Formation
13:18

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Published on: November 1, 2007

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09:30

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09:11

Revealing Neural Circuit Topography in Multi-Color

Published on: November 14, 2011

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Circuitry

Background:

  • Neural circuits often involve competitive input selection, where multiple connections vie for territory on target cells.
  • This process can lead to atypical circuits, but their adaptive value (maladaptive vs. resilient) is not always clear.

Purpose of the Study:

  • To investigate the role of neurotransmission-dependent competition in forming resilient circuits using the olivocerebellar climbing fiber system.
  • To determine if atypical circuits formed under compromised input conditions are maladaptive or promote functional resilience.

Main Methods:

  • Studied the olivocerebellar climbing fiber circuit, focusing on Purkinje cell innervation.
  • Manipulated neurotransmission from olivocerebellar neurons to observe effects on climbing fiber competitiveness and circuit formation.
  • Assessed motor control and social behaviors to evaluate functional outcomes.

Main Results:

  • Eliminating approximately 50% of olivocerebellar neuron neurotransmission reduced climbing fiber competitiveness and decreased the survival of parental inferior olive neurons.
  • Functional climbing fibers successfully expanded their innervation territory, forming atypical circuits.
  • Despite circuit alterations, climbing-fiber-dependent motor control was minimally affected, and social behaviors remained fully preserved.

Conclusions:

  • Neurotransmission-dependent competition is crucial for the formation of resilient neural circuits.
  • The cerebellum can maintain complex behaviors even with a substantial proportion of developmentally compromised inputs.
  • This competitive process promotes functional resilience, ensuring behavioral integrity despite input loss.