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Related Concept Videos

Myasthenia Gravis: Overview and Treatment01:20

Myasthenia Gravis: Overview and Treatment

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 leads...
Myasthenia Gravis ll: Pathophysiology01:22

Myasthenia Gravis ll: Pathophysiology

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...
Satellite Stem Cells and Muscular Dystrophy01:21

Satellite Stem Cells and Muscular Dystrophy

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...
Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

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...
Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is to...
Secondary Spinal Cord Injury llI: Pathophysiology01:25

Secondary Spinal Cord Injury llI: Pathophysiology

Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...

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Related Experiment Video

Updated: Jun 2, 2026

Dissection of the Transversus Abdominis Muscle for Whole-mount Neuromuscular Junction Analysis
06:12

Dissection of the Transversus Abdominis Muscle for Whole-mount Neuromuscular Junction Analysis

Published on: January 11, 2014

Spinal muscular atrophy: a timely review.

Stephen J Kolb1, John T Kissel

  • 1Department of Neurology, Ohio State University, Columbus, 43210, USA.

Archives of Neurology
|April 13, 2011
PubMed
Summary

Spinal muscular atrophy (SMA) is a neurodegenerative disease impacting motor neurons. Advances in understanding its genetics and pathophysiology enable effective therapeutic development for this condition.

Area of Science:

  • Neurology
  • Genetics
  • Molecular Biology

Background:

  • Spinal muscular atrophy (SMA) is a neurodegenerative disease causing motor neuron loss and muscle weakness.
  • The most prevalent form, autosomal recessive proximal SMA, stems from mutations in the survival of motor neurons (SMN1) gene.

Observation:

  • Significant progress in understanding SMA's molecular genetics and pathophysiology over 15 years.
  • The primary therapeutic goal is to elevate SMN protein levels in affected cells.

Findings:

  • Current research facilitates in vitro screening, reliable animal model testing, and clinical trials for potential SMA therapies.
  • Early or presymptomatic diagnosis of SMA is now achievable.

Implications:

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Intraspinal Cell Transplantation for Targeting Cervical Ventral Horn in Amyotrophic Lateral Sclerosis and Traumatic Spinal Cord Injury
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Intraspinal Cell Transplantation for Targeting Cervical Ventral Horn in Amyotrophic Lateral Sclerosis and Traumatic Spinal Cord Injury

Published on: September 18, 2011

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Last Updated: Jun 2, 2026

Dissection of the Transversus Abdominis Muscle for Whole-mount Neuromuscular Junction Analysis
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Dissection of the Transversus Abdominis Muscle for Whole-mount Neuromuscular Junction Analysis

Published on: January 11, 2014

Clinical Testing and Spinal Cord Removal in a Mouse Model for Amyotrophic Lateral Sclerosis (ALS)
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Clinical Testing and Spinal Cord Removal in a Mouse Model for Amyotrophic Lateral Sclerosis (ALS)

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Intraspinal Cell Transplantation for Targeting Cervical Ventral Horn in Amyotrophic Lateral Sclerosis and Traumatic Spinal Cord Injury
10:49

Intraspinal Cell Transplantation for Targeting Cervical Ventral Horn in Amyotrophic Lateral Sclerosis and Traumatic Spinal Cord Injury

Published on: September 18, 2011

  • This review highlights key milestones in developing effective SMA therapies.
  • Prioritizing and advancing promising treatments efficiently and safely is crucial for the SMA community.