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Related Concept Videos

Cross-bridge Cycle01:26

Cross-bridge Cycle

As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

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...
Satellite Stem Cells and Muscular Dystrophy01:21

Satellite Stem Cells and Muscular Dystrophy

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...
Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
Myasthenia Gravis: Overview and Treatment01:20

Myasthenia Gravis: Overview and Treatment

Myasthenia gravis is a neuromuscular transmission disorder characterized by weakness and increased fatigability of skeletal muscles. It is an autoimmune disease affecting approximately one in 2000 people, where antibodies against the α1 subunit of nicotinic acetylcholine receptors are produced.
These antibodies interfere with the function of the nicotinic receptors in three ways: by binding to the receptor and disrupting acetylcholine binding; by causing cross-linking of receptors which leads...
Myasthenia Gravis ll: Pathophysiology01:22

Myasthenia Gravis ll: Pathophysiology

The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...

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Related Experiment Video

Updated: Jul 4, 2026

Dissection of the Transversus Abdominis Muscle for Whole-mount Neuromuscular Junction Analysis
06:12

Dissection of the Transversus Abdominis Muscle for Whole-mount Neuromuscular Junction Analysis

Published on: January 11, 2014

Spinal muscular atrophy.

Mitchell R Lunn1, Ching H Wang

  • 1Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA.

Lancet (London, England)
|June 24, 2008
PubMed
Summary

Spinal muscular atrophy (SMA) is a genetic disease causing motor neuron loss and muscle weakness. Advances in understanding its molecular basis have led to new therapeutic strategies and improved patient care.

Area of Science:

  • Neurology
  • Genetics
  • Molecular Biology

Background:

  • Spinal muscular atrophy (SMA) is an autosomal recessive neurodegenerative disorder.
  • Characterized by motor neuron degeneration, skeletal muscle atrophy, and generalized weakness.
  • Caused by homozygous disruption of the Survival Motor Neuron 1 (SMN1) gene.

Purpose of the Study:

  • To provide a comprehensive review of spinal muscular atrophy.
  • Integrate clinical manifestations, molecular pathogenesis, diagnostic strategies, and therapeutic developments.
  • Discuss evidence from clinical trials and changes in the standard of care.

Main Methods:

  • Literature review and synthesis of existing research.
  • Analysis of clinical manifestations and molecular pathogenesis.

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Delivery of Therapeutic Agents Through Intracerebroventricular (ICV) and Intravenous (IV) Injection in Mice
05:55

Delivery of Therapeutic Agents Through Intracerebroventricular (ICV) and Intravenous (IV) Injection in Mice

Published on: October 3, 2011

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Last Updated: Jul 4, 2026

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Systemic Delivery of MicroRNA Using Recombinant Adeno-associated Virus Serotype 9 to Treat Neuromuscular Diseases in Rodents

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05:55

Delivery of Therapeutic Agents Through Intracerebroventricular (ICV) and Intravenous (IV) Injection in Mice

Published on: October 3, 2011

  • Evaluation of diagnostic strategies and therapeutic development, including clinical trial data.
  • Main Results:

    • Elucidation of molecular pathogenesis mechanisms.
    • Development of treatment strategies targeting the SMN1 gene region.
    • Identification of candidate treatment agents in various stages of development.

    Conclusions:

    • Advances in medical technology have significantly altered the standard of care for SMA patients.
    • Ongoing research continues to refine diagnostic approaches and therapeutic interventions.
    • A comprehensive understanding of SMA is crucial for effective patient management.