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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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Myasthenia Gravis: Diagnostic Tests01:15

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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.
The edrophonium test is a diagnostic tool for myasthenia gravis. It involves...
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Chemical Synapses01:26

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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.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
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Chemical Synapses01:26

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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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Myasthenia Gravis: Overview and Treatment01:20

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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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Muscle Recovery and Fatigue01:24

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Related Experiment Video

Updated: Nov 29, 2025

Manual Muscle Testing: A Method of Measuring Extremity Muscle Strength Applied to Critically Ill Patients
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Approach to Acute Weakness.

Deena Khamees1, William Meurer1

  • 1Emergency Medicine, University of Michigan Medical School, 1500 East Medical Center Drive, Ann Arbor, MI 48109-5303, USA.

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|November 21, 2020
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Summary

Diagnosing weakness involves examining the nervous system from brain to muscle. Clinicians must differentiate new conditions from exacerbations and consider serious causes for emergency presentations.

Keywords:
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Area of Science:

  • Neurology
  • Clinical Medicine

Background:

  • Weakness presents a broad differential diagnosis.
  • Understanding the involved part of the nervous system aids diagnosis, from the brain to the neuromuscular junction.
  • Distinguishing new disease processes from exacerbations of existing conditions is crucial.

Purpose of the Study:

  • To provide a framework for diagnosing weakness.
  • To emphasize the importance of considering the nervous system's anatomical divisions.
  • To highlight the need for careful evaluation of emergency presentations of weakness.

Main Methods:

  • Systematic review of diagnostic approaches to weakness.
  • Categorization of weakness by anatomical location within the nervous system.
  • Consideration of internal vs. external etiologies.

Main Results:

  • A structured approach aids in organizing the differential diagnosis of weakness.
  • Subtle neurologic conditions can pose risks if not promptly identified.
  • Emergency department presentations require careful assessment for potentially serious causes.

Conclusions:

  • A systematic, anatomically-based approach is essential for diagnosing weakness.
  • Prompt recognition of subtle neurologic signs is vital to prevent decompensation.
  • Thorough evaluation is necessary for emergency weakness presentations to rule out severe underlying pathology.