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Related Concept Videos

Motor Units00:46

Motor Units

61.8K
A motor unit consists of two main components: a single efferent motor neuron (i.e., a neuron that carries impulses away from the central nervous system) and all of the muscle fibers it innervates. The motor neuron may innervate multiple muscle fibers, which are single cells, but only one motor neuron innervates a single muscle fiber.
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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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Motor Units01:13

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The motor unit is a fundamental component of the neuromuscular system and plays a crucial role in coordinating muscle contractions. It consists of a somatic motor neuron, which connects and controls multiple skeletal muscle fibers, forming a single functional segment. The axon of the motor neuron branches out and establishes synaptic connections known as neuromuscular junctions with individual muscle fibers within the motor unit.
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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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Hierarchy of Motor Control01:18

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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

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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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Related Experiment Video

Updated: Jan 25, 2026

The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task
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The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task

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Ipsilateral synkinesia involves the supplementary motor area.

Arash Salardini1, Nandakumar S Narayanan, Jagriti Arora

  • 1Department of Neurology, Yale University School of Medicine, United States.

Neuroscience Letters
|July 5, 2012
PubMed
Summary
This summary is machine-generated.

The supplementary motor area is crucial for coordinating movements. This study suggests its involvement in involuntary movement coordination seen in synkinesia patients.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Brain Imaging

Background:

  • The supplementary motor area (SMA) is known to coordinate voluntary movements.
  • Synkinesia involves involuntary movements accompanying voluntary actions.
  • The specific role of the SMA in synkinesia remains unclear.

Purpose of the Study:

  • To investigate the hypothesis that the supplementary motor area is involved in the involuntary coordination of movement.
  • To explore the neural mechanisms underlying synkinesia.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to collect brain activity data.
  • Two patients with ipsilateral hand-foot synkinesia and two healthy controls participated.
  • Participants performed rhythmic motor tasks involving hand movements.

Main Results:

  • In synkinesia patients, significant activation was observed in both the supplementary motor area and the foot motor cortex during a hand motor task.
  • This distinct pattern of activation was not present in the control group.
  • fMRI data revealed differential brain activity patterns related to synkinesia.

Conclusions:

  • The findings suggest a central role for the supplementary motor area in the involuntary coordination characteristic of synkinesia.
  • This research provides new insights into how the supplementary motor area orchestrates complex movements and contributes to motor disorders.