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Related Concept Videos

Direct Motor Pathways01:11

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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.
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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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Related Experiment Video

Updated: Feb 18, 2026

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
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Axon pathfinding for locomotion.

Dario Bonanomi1

  • 1Molecular Neurobiology Laboratory, Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy.

Seminars in Cell & Developmental Biology
|November 16, 2017
PubMed
Summary
This summary is machine-generated.

Spinal cord motor neurons guide limb muscle connections using multiple, hierarchically linked signals. This complex system ensures accurate axon pathfinding for movement and development.

Keywords:
Axon guidance signalingLimb innervationMotor neuron subtypesNeural circuit developmentNeuromuscular connectionsSpinal cord

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Motor System Development

Background:

  • Motor neurons in the spinal cord form neuromuscular connections essential for movement.
  • Topographic organization of motor neuron projections to limb muscles is key to understanding motor system development.
  • Motor neuron subtypes establish a binary map for limb innervation, guided by numerous directional cues.

Purpose of the Study:

  • To investigate the role of multiple directional cues in motor neuron pathfinding.
  • To understand how converging signaling pathways cooperate in axon guidance.
  • To determine the integration of guidance signals by growth cones for specific axonal trajectories.

Main Methods:

  • Analysis of genetically defined motor neuron subtypes.
  • Studying axonal projections to peripheral muscle targets in vertebrates.
  • Investigating signaling pathways and their hierarchical linkage.

Main Results:

  • A large number of directional cues guide the topographic organization of motor neuron innervation.
  • Converging signaling pathways are hierarchically linked, not redundant.
  • These pathways cooperate to enhance the fidelity of axon pathfinding decisions.

Conclusions:

  • Motor neuron guidance involves a complex interplay of multiple, hierarchically organized signaling pathways.
  • Understanding signal integration in growth cones is crucial for delineating class-specific axonal trajectories.
  • This research provides fundamental principles of motor system development and neuronal guidance.