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Related Concept Videos

Muscle Contraction01:10

Muscle Contraction

9.2K
In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive...
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Muscle Contraction01:15

Muscle Contraction

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Motor Unit Stimulation01:20

Motor Unit Stimulation

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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.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
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The Neuromuscular Junction01:19

The Neuromuscular Junction

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The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
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Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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Neuromuscular Junction And Blockade01:29

Neuromuscular Junction And Blockade

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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
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Related Experiment Video

Updated: Mar 11, 2026

Physiological Recordings of High and Low Output NMJs on the Crayfish Leg Extensor Muscle
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Primate Neurons Flex Their Musclin.

Alex A Pollen1, Arnold R Kriegstein1

  • 1Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA 94143, USA; Department of Neurology, University of California, San Francisco, San Francisco, CA 94158, USA.

Neuron
|November 25, 2016
PubMed
Summary

Primates evolved unique gene responses to sensory experiences. These novel transcriptional changes, including musclin/osteocrin (OSTN) induction, may shape primate neural circuits.

Keywords:
MEF2CNPR3OSTNactivity-dependent gene expressionosteocrin/musclinprimate neocortex evolution

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Extracellularly Identifying Motor Neurons for a Muscle Motor Pool in Aplysia californica
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Membrane Potentials, Synaptic Responses, Neuronal Circuitry, Neuromodulation and Muscle Histology Using the Crayfish: Student Laboratory Exercises
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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Sensory experiences induce lasting neural circuit modifications via activity-dependent gene expression.
  • Understanding the evolutionary basis of neural plasticity is crucial for deciphering primate brain function.

Purpose of the Study:

  • To investigate novel transcriptional responses to neuronal activity in primates.
  • To identify genes involved in primate-specific neural circuit adaptations.

Main Methods:

  • Analysis of gene expression patterns in primate neural tissues.
  • Identification of activity-dependent transcriptional changes.

Main Results:

  • Discovery of primate-specific transcriptional responses to neuronal activity.
  • Identification of musclin/osteocrin (OSTN) induction as a novel response.
  • OSTN's potential role in regulating specialized primate neural circuits.

Conclusions:

  • Primates possess unique molecular mechanisms for neural circuit adaptation.
  • Musclin/osteocrin (OSTN) represents a novel factor in primate neural plasticity and evolution.