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Related Concept Videos

Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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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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Related Experiment Video

Updated: Jul 19, 2025

Investigating the Pathogenesis of MYH7 Mutation Gly823Glu in Familial Hypertrophic Cardiomyopathy using a Mouse Model
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Muscle channelopathies.

Vinojini Vivekanandam1, Dipa Jayaseelan2, Michael G Hanna1

  • 1Centre for Neuromuscular Disorders, Queen Square UCL Institute of Neurology, London, United Kingdom.

Handbook of Clinical Neurology
|August 10, 2023
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Summary

Muscle channelopathies cause episodic muscle stiffness and weakness. Diagnosis via genetic sequencing allows tailored symptomatic treatment for these rare genetic disorders.

Keywords:
ChannelopathyChloride channelEpisodic weaknessMyotoniaPeriodic paralysisSodium channel

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Area of Science:

  • Neurology
  • Genetics

Background:

  • Muscle channelopathies are episodic disorders causing muscle stiffness and weakness.
  • Includes myotonic conditions (e.g., myotonia congenita) and periodic paralyses (e.g., hypokalemic periodic paralysis).

Approach:

  • Diagnosis relies on clinical history, confirmed by next-generation genetic sequencing.
  • Neurophysiology studies and MRI can supplement diagnosis.
  • Expanding genetic testing reveals broader phenotypes, including pediatric and congenital forms.

Key Points:

  • Myotonic conditions feature muscle stiffness.
  • Periodic paralysis conditions involve episodic weakness.
  • Andersen-Tawil syndrome requires cardiac evaluation.

Conclusions:

  • Accurate diagnosis is crucial for effective, individualized symptomatic treatment.
  • Management necessitates a multidisciplinary approach, with special considerations for anesthesia and pregnancy.
  • Genetic insights guide tailored therapeutic strategies for muscle channelopathies.