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Related Concept Videos

Hierarchy of Motor Control01:18

Hierarchy of Motor Control

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The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.
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Direct Motor Pathways01:11

Direct Motor Pathways

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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.
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...
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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.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
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Generation of Action Potential in Skeletal Muscles01:24

Generation of Action Potential in Skeletal Muscles

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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...
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Muscles of the Leg that Move the Foot and Toes01:28

Muscles of the Leg that Move the Foot and Toes

4.4K
The human leg comprises an intricate system of muscles that facilitate the movement of feet and toes. Within this system, the muscles are categorized into the anterior, lateral, and posterior compartments, each with a unique set of muscles carrying out specific functions.
Anterior Compartment
The anterior compartment includes muscles that contribute to the dorsiflexion of the foot. This compartment houses the tibialis anterior, extensor hallucis longus, and extensor digitorum longus muscles....
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Design Example: Frog Muscle Response01:14

Design Example: Frog Muscle Response

637
A student is tasked to work on an intriguing experiment involving an RL (Resistor-Inductor) circuit to study the muscle response of a frog's leg to electrical stimulation. The RL circuit plays a crucial role in this experiment, providing the means to control and measure the electrical impulses that trigger muscle contraction.
When the switch connecting the RL circuit is closed, a brief muscle contraction is observed. This is because, at a steady state, the inductor acts like a short...
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Related Experiment Video

Updated: Mar 4, 2026

Studying the Neural Basis of Adaptive Locomotor Behavior in Insects
10:19

Studying the Neural Basis of Adaptive Locomotor Behavior in Insects

Published on: April 13, 2011

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Redefining the central pattern generator for vertebrate locomotion.

Abdeljabbar El Manira1

  • 1Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden. abdel.elmanira@ki.se.

Nature Reviews. Neuroscience
|March 2, 2026
PubMed
Summary
This summary is machine-generated.

Central pattern generators (CPGs) are redefined as dynamic, modular systems, not just rhythm generators. Zebrafish research reveals adaptable, multilayered control of vertebrate locomotion influenced by sensory feedback.

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Kinematics and Ground Reaction Force Determination: A Demonstration Quantifying Locomotor Abilities of Young Adult, Middle-aged, and Geriatric Rats
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Zebrafish In Situ Spinal Cord Preparation for Electrophysiological Recordings from Spinal Sensory and Motor Neurons
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Zebrafish In Situ Spinal Cord Preparation for Electrophysiological Recordings from Spinal Sensory and Motor Neurons

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Related Experiment Videos

Last Updated: Mar 4, 2026

Studying the Neural Basis of Adaptive Locomotor Behavior in Insects
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Kinematics and Ground Reaction Force Determination: A Demonstration Quantifying Locomotor Abilities of Young Adult, Middle-aged, and Geriatric Rats
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Zebrafish In Situ Spinal Cord Preparation for Electrophysiological Recordings from Spinal Sensory and Motor Neurons
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Area of Science:

  • Neuroscience
  • Zoology
  • Biomechanics

Background:

  • The central pattern generator (CPG) concept is fundamental to understanding vertebrate locomotion.
  • Recent zebrafish research challenges the classical view of CPGs as simple rhythm generators.

Purpose of the Study:

  • To redefine the CPG as a dynamic, modular, and hybrid sensorimotor system based on zebrafish models.
  • To compare conserved and divergent CPG principles between zebrafish and mammals.

Main Methods:

  • Utilizing zebrafish as a primary model system for circuit-level neuroscience.
  • Comparing findings in zebrafish with conserved and divergent principles in mammals.

Main Results:

  • CPGs are composed of speed-specific modules activated by "gear-shifting" mechanisms.
  • Brainstem circuits act as layered controllers for locomotion initiation and modulation.
  • Motor neurons and proprioceptors are integral CPG components influencing rhythm and coordination.

Conclusions:

  • The vertebrate CPG is a highly adaptable, multilayered control system tuned by sensory feedback and descending input.
  • Zebrafish research provides a roadmap for decoding adaptive movement and offers testable hypotheses for terrestrial vertebrates.