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Related Concept Videos

Multiple Sclerosis l: Introduction01:19

Multiple Sclerosis l: Introduction

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Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...
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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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Alterations in Muscle Tone lll01:11

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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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Skeletal muscle relaxants are a group of drugs that can reduce muscle stiffness and induce temporary paralysis to relieve pain. These agents can act centrally to reduce muscle tone or spasms in painful conditions such as multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), or spinal injuries; they are called antispasmodics or spasmolytics.
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Myasthenia Gravis ll: Pathophysiology01:22

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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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Myasthenia gravis is an autoimmune condition affecting neuromuscular transmission, causing generalized weakness in skeletal muscles. Initial diagnoses rely on patients' signs, symptoms, and medical history. The challenge lies in distinguishing myasthenia from other muscular dystrophies. An important diagnostic feature is the significant improvement of symptoms after administering anticholinesterase inhibitors.
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Related Experiment Video

Updated: Apr 23, 2026

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Published on: December 18, 2016

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Multiple sclerosis affects skeletal muscle characteristics.

Inez Wens1, Ulrik Dalgas2, Frank Vandenabeele1

  • 1REVAL - Rehabilitation Research Center, BIOMED - Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, Hasselt, Belgium.

Plos One
|September 30, 2014
PubMed
Summary
This summary is machine-generated.

Multiple sclerosis (MS) negatively impacts skeletal muscle in patients, leading to smaller muscle fibers and reduced strength. This highlights the need for targeted rehabilitation to preserve lower limb muscle mass.

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Area of Science:

  • Neurology
  • Skeletal Muscle Physiology
  • Biomedical Science

Background:

  • The effects of multiple sclerosis (MS) on skeletal muscle characteristics like fiber size, type, strength, and mass are not fully understood.
  • Previous research presents conflicting findings regarding MS's impact on muscle health.

Purpose of the Study:

  • To investigate the influence of MS on skeletal muscle characteristics.
  • To compare muscle fiber cross-sectional area (CSA), fiber type proportion, muscle strength, and body composition between MS patients and healthy controls.

Main Methods:

  • A cross-sectional study involving 34 MS patients (Expanded Disability Status Scale [EDSS]: 2.5±0.19) and 18 healthy controls (HC).
  • Assessment of quadriceps muscle strength and body composition.
  • Muscle biopsies of the vastus lateralis were obtained for histological analysis.

Main Results:

  • MS patients exhibited smaller mean muscle fiber CSA (all fibers, type I, II, and IIa) compared to HC.
  • Quadriceps muscle strength was significantly lower in MS patients.
  • While whole-body composition was similar, the biopsied leg in MS patients showed a trend towards higher fat percentage and lower lean mass.

Conclusions:

  • Multiple sclerosis appears to adversely affect skeletal muscle fiber CSA, strength, and mass in the lower limbs of mildly affected individuals.
  • These findings underscore the importance of implementing rehabilitation programs focused on preserving lower limb muscle in MS patients.