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Classification of Skeletal Muscle Fibers01:48

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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Types of Skeletal Muscle Fibers01:32

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Skeletal muscles comprise various fibers, each with distinct characteristics and roles in movement and stability. They are mainly categorized into three types — fast-twitch, slow-twitch, and intermediate.
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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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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.
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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 Fiber Composition Changes after Selective Nerve Innervation.

Shiho Watanabe1,2, Hiroko Ochiai2, Hisashi Sakuma3

  • 1Department of Plastic and Reconstructive Surgery, Okayama University Hospital, Okayama 700-8558, Japan.

International Journal of Molecular Sciences
|July 27, 2022
PubMed
Summary

Dual nerve grafting improves facial muscle function after paralysis. Suturing the masseteric and hypoglossal nerves in rats enhanced muscle oxidative properties, supporting this technique for facial paralysis treatment.

Keywords:
dualinnervationfacial paralysismasseter musclemuscle fiber type

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Area of Science:

  • Neurosurgery
  • Muscle Physiology
  • Molecular Biology

Background:

  • Facial nerve paralysis impairs facial movement.
  • Free muscle flaps are used for reconstruction but struggle with resting tonus.
  • Dual innervation techniques, adding nerves like the hypoglossal or contralateral facial nerve, are employed.

Purpose of the Study:

  • To evaluate the effectiveness of a dual innervation technique for facial paralysis.
  • To assess the impact of nerve suturing on muscle characteristics.

Main Methods:

  • Utilized 10-week-old rats (n=10).
  • Created a suture group by connecting the masseteric and hypoglossal nerves.
  • Established a control cut group with a cauterized masseteric nerve.
  • Performed immunohistochemistry and microarray analysis on masseter muscles.

Main Results:

  • Immunohistochemistry indicated that sutured muscles developed oxidative characteristics.
  • Microarray analysis revealed upregulated genes related to mitochondrial function, including Perm1.
  • The dual innervation technique demonstrated positive effects on muscle properties.

Conclusions:

  • The dual innervation technique, specifically nerve suturing, is a valid approach for treating facial paralysis.
  • This method promotes desirable oxidative changes in reconstructed facial muscles.
  • Further research into mitochondrial gene expression can optimize treatment strategies.