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Related Concept Videos

Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

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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...
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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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Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
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Alterations in Muscle Tone ll01:12

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Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
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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.
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Related Experiment Video

Updated: May 3, 2026

Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
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Recent advances in myotonic dystrophy type 2.

Christina M Ulane1, Sarah Teed, Jacinda Sampson

  • 1Department of Neurology, The Neurological Institute, Columbia University Medical Center, 710 West 168 St., New York, NY, 10032, USA, cu2119@mail.cumc.columbia.edu.

Current Neurology and Neuroscience Reports
|January 18, 2014
PubMed
Summary
This summary is machine-generated.

Myotonic dystrophy type 2 (DM2) is a common adult muscular dystrophy. Recent research clarifies DM2 diagnosis, systemic features, and molecular mechanisms, distinguishing it from DM1.

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Area of Science:

  • Neurology
  • Genetics
  • Molecular Biology

Background:

  • Myotonic dystrophy is the most frequent adult muscular dystrophy.
  • Myotonic dystrophy type 1 (DM1) and type 2 (DM2) share features but have distinct characteristics.
  • Historically, DM1 has been more extensively studied than DM2.

Purpose of the Study:

  • To review recent advancements in understanding Myotonic dystrophy type 2 (DM2).
  • To focus on DM2 diagnosis, systemic manifestations, and molecular underpinnings.
  • To highlight the specific developments in DM2, differentiating it from DM1.

Main Methods:

  • Literature review of recent scientific publications on Myotonic dystrophy type 2.
  • Synthesis of findings related to diagnostic criteria and methods for DM2.
  • Analysis of studies detailing systemic features and molecular mechanisms of DM2.

Main Results:

  • Significant progress has been made in the diagnosis of DM2.
  • A broader spectrum of systemic features associated with DM2 has been identified.
  • New insights into the molecular mechanisms underlying DM2 pathogenesis have emerged.

Conclusions:

  • Recent research has substantially improved the understanding of Myotonic dystrophy type 2.
  • The review highlights key developments in DM2 diagnosis, systemic involvement, and molecular basis.
  • Continued research is crucial for further elucidating and managing DM2.