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Related Concept Videos

Myasthenia Gravis: Diagnostic Tests01:15

Myasthenia Gravis: Diagnostic Tests

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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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Disorders of the Skeletal Muscle01:28

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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: Overview and Treatment01:20

Myasthenia Gravis: Overview and Treatment

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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.
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...
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Chemical Synapses01:26

Chemical Synapses

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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

Chemical Synapses

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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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Muscles of the Eye01:20

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The muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
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Related Experiment Video

Updated: Apr 7, 2026

Utility of Dissociated Intrinsic Hand Muscle Atrophy in the Diagnosis of Amyotrophic Lateral Sclerosis
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Is Isolated Inferior Rectus Weakness a Strong Indicator for Myasthenia Gravis?

Emma Butterworth1, Jessy Choi1, Martin Rhodes1

  • 1Sheffield Teaching Hospitals NHS Foundation Trust, UK.

The British and Irish Orthoptic Journal
|April 6, 2026
PubMed
Summary
This summary is machine-generated.

Isolated inferior rectus weakness (IRW) does not indicate myasthenia gravis (MG). Further testing for MG is not recommended for patients with isolated IRW, but rather for those with other characteristic MG symptoms.

Keywords:
Acetylcholine receptor antibodyAcetylcholine receptor antibody testingInferior RectusMGMyasthenia Gravis

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Manual Muscle Testing: A Method of Measuring Extremity Muscle Strength Applied to Critically Ill Patients
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Area of Science:

  • Ophthalmology
  • Neurology

Background:

  • Isolated inferior rectus weakness (IRW) is a potential sign of myasthenia gravis (MG).
  • Orthoptists frequently identify IRW, leading to further investigations.

Purpose of the Study:

  • To evaluate if patients with IRW or other symptoms were diagnosed with MG.
  • To determine the diagnostic value of isolated IRW in identifying myasthenia gravis.

Main Methods:

  • Retrospective review of patient case notes from 2010-2023.
  • Inclusion of patients who underwent acetylcholine receptor antibody (ACR) testing.
  • Grouping patients based on isolated IRW, suspected thyroid eye disease, or MG characteristics.

Main Results:

  • Ten out of 62 patients (16.13%) were diagnosed with MG.
  • No patients with isolated IRW were diagnosed with MG.
  • All MG diagnoses were associated with multiple extra-ocular muscle weaknesses and characteristic MG symptoms.

Conclusions:

  • Isolated IRW alone is not indicative of myasthenia gravis.
  • Characteristic MG signs and symptoms are crucial for diagnosis.
  • The necessity of MG investigative testing for isolated IRW requires further consideration.