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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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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...
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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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Mechanical control: parallel pathways for modulating movement.

Crystal M Reynaga1,2, Emanuel Azizi3

  • 1Department of Evolution, Ecology, and Organismal Biology, University of California, Riverside, Riverside, CA 92521, USA.

The Journal of Experimental Biology
|April 13, 2026
PubMed
Summary
This summary is machine-generated.

Animals use mechanical properties, not just neural control, for stable and efficient movement. This passive system offers faster responses than active neural feedback, especially during high speeds or disturbances.

Keywords:
Embodied intelligenceIntrinsic propertiesMechanical controlModulationPassive mechanismsStructural control

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Area of Science:

  • Biomechanics
  • Animal Locomotion
  • Neuroscience

Background:

  • Traditional view emphasizes active neural feedback for animal movement control.
  • Neural responsiveness can be too slow for rapid environmental changes or high speeds.
  • Understanding movement control requires considering non-neural mechanisms.

Purpose of the Study:

  • Highlight the significance of non-neural, mechanical control in locomotion.
  • Explore how passive mechanical properties complement active neural control.
  • Provide a framework for understanding the interplay between passive and active control.

Main Methods:

  • Review of existing literature on animal locomotion and control mechanisms.
  • Synthesis of findings on intrinsic muscle properties, elastic structures, and tissue compliance.
  • Analysis of trade-offs between passive and active control strategies.

Main Results:

  • Non-neural mechanical control allows rapid modulation of locomotor systems.
  • Passive mechanisms provide faster, more reliable responses than neural feedback in certain conditions.
  • Mechanical control enhances stability and energetic efficiency, particularly during perturbations.

Conclusions:

  • Mechanical control is crucial for rapid adjustments in locomotion across diverse taxa.
  • Passive and active control mechanisms function in parallel to optimize movement.
  • Further research into mechanical control can reveal new insights into biological systems.