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Related Concept Videos

Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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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.
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Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
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Propagation of Action Potentials01:23

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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
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Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
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Structured Variability in Purkinje Cell Activity during Locomotion.

Britton A Sauerbrei1, Evgueniy V Lubenov2, Athanassios G Siapas3

  • 1Computation and Neural Systems Program, California Institute of Technology, Pasadena, CA 91125, USA.

Neuron
|August 21, 2015
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Summary

Cerebellar Purkinje cells

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Area of Science:

  • Neuroscience
  • Motor Control
  • Computational Neuroscience

Background:

  • The cerebellum is crucial for sensorimotor control.
  • Purkinje cells in the cerebellum are rhythmically active during locomotion.
  • Variations in Purkinje cell activity across steps and their behavioral links are poorly understood.

Purpose of the Study:

  • To investigate the step-to-step variation in cerebellar Purkinje cell activity.
  • To explore the statistical structure and afferent mechanisms influencing this activity.
  • To determine the relationship between Purkinje cell firing patterns and behavior during locomotion.

Main Methods:

  • Utilized multi-electrode recordings in freely moving rats.
  • Analyzed step-locked firing rates of Purkinje cells.
  • Investigated the influence of behavioral variables on neural activity.

Main Results:

  • Behavioral variables systematically alter the shape of step-locked Purkinje cell firing rates.
  • This influence is strongly dependent on the step cycle phase, revealing functional cell clusters.
  • Distinct patterns of variability arise from parallel and climbing fiber inputs.

Conclusions:

  • Purkinje cell activity encodes not only step phase but is also dynamically shaped by behavior.
  • This dynamic shaping facilitates movement control in changing conditions.
  • The findings suggest a sophisticated role for the cerebellum in adaptive motor control.