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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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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: 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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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.
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Utility of Dissociated Intrinsic Hand Muscle Atrophy in the Diagnosis of Amyotrophic Lateral Sclerosis
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Focal amyotrophy in multiple sclerosis.

Rabia Malik1, Viktoriya Irodenko, Lara Zimmermann

  • 1Department of Neurology, San Francisco VA Medical Center, University of California, 505 Parnassus Avenue, Box 0114, M-798, San Francisco, California, 94143, USA.

Muscle & Nerve
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PubMed
Summary
This summary is machine-generated.

Multiple sclerosis (MS) can affect gray matter, causing lower motor neuron symptoms. This case study highlights MS involvement of anterior horn cells or spinal motor nerve roots leading to arm weakness and pain.

Keywords:
amyotrophyaxonaldemyelinationmultiple sclerosisspinal cord

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Area of Science:

  • Neurology
  • Neuroimmunology

Background:

  • Multiple sclerosis (MS) is increasingly recognized to affect gray matter, challenging the traditional white matter disease paradigm.
  • Axonal damage and neuronal loss occur in cortical, subcortical, and spinal cord gray matter in MS.

Observation:

  • A 71-year-old male with primary progressive MS presented with right arm pain and weakness.
  • Neurological examination revealed atrophy, weakness, and hyporeflexia in the right arm.

Findings:

  • Electromyography (EMG) indicated acute and chronic partial denervation in the right arm.
  • Magnetic resonance imaging (MRI) showed asymmetric spinal cord volume loss and T2 signal changes (C3-C7) without nerve root compression.

Implications:

  • This case suggests MS can cause lower motor neuron involvement through anterior horn cell or spinal motor nerve root pathology.
  • Understanding gray matter involvement in MS is crucial for diagnosing and managing diverse clinical presentations.