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Related Concept Videos

Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...
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...
Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin

Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
The binding of dantrolene to the RYR1...
Tetanus01:29

Tetanus

Tetanus is a life-threatening neurological disorder characterized by persistent muscle contractions and spastic paralysis. It is caused by Clostridium tetani, a motile, Gram-positive, rod-shaped, obligate anaerobe. These bacteria produce terminal endospores, giving them a distinctive “lollipop” or “tennis-racket” appearance. They thrive in anaerobic environments, such as those found in deep puncture wounds.Once introduced into the body, the spores germinate into vegetative cells. These cells...
Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

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...
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...

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Related Experiment Video

Updated: Jun 11, 2026

Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia
10:05

Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia

Published on: January 27, 2018

Craniocervical dystonia: clinical and pathophysiological features.

C Colosimo1, A Suppa, G Fabbrini

  • 1Department of Neurological Sciences, Sapienza University of Rome, Rome, Italy.

European Journal of Neurology
|July 2, 2010
PubMed
Summary

Craniocervical dystonias like blepharospasm cause involuntary muscle spasms. Botulinum toxin injections are the most effective treatment for these neurological movement disorders.

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Last Updated: Jun 11, 2026

Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia
10:05

Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia

Published on: January 27, 2018

Implantation of Osmotic Pumps and Induction of Stress to Establish a Symptomatic, Pharmacological Mouse Model for DYT/PARK-ATP1A3 Dystonia
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Implantation of Osmotic Pumps and Induction of Stress to Establish a Symptomatic, Pharmacological Mouse Model for DYT/PARK-ATP1A3 Dystonia

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09:51

Rapid Genotyping of Animals Followed by Establishing Primary Cultures of Brain Neurons

Published on: January 29, 2015

Area of Science:

  • Neurology
  • Movement Disorders
  • Neuroscience

Background:

  • Craniocervical dystonias, including blepharospasm, oromandibular, lingual, laryngeal, and cervical dystonia, are common adult-onset conditions.
  • These dystonias can occur independently or coexist, presenting with involuntary muscle spasms and abnormal postures.
  • Clinical features vary, necessitating a nuanced understanding of each type.

Purpose of the Study:

  • To summarize the clinical presentation and underlying pathophysiology of craniocervical dystonias.
  • To highlight the role of basal ganglia-thalamo-cortical circuit dysfunction.
  • To identify the optimal therapeutic approach for these conditions.

Main Methods:

  • Review of neurophysiologic and neuroimaging studies.
  • Analysis of clinical features across different craniocervical dystonias.
  • Evaluation of treatment outcomes for botulinum toxin therapy.

Main Results:

  • Craniocervical dystonias involve motor and sensory abnormalities at cortical and subcortical levels.
  • Evidence suggests dysfunction within the basal ganglia-thalamo-cortical circuits.
  • Botulinum toxin injections into overactive muscles represent the primary treatment modality.

Conclusions:

  • Craniocervical dystonias are complex neurological disorders with shared and distinct clinical characteristics.
  • Understanding the neurobiological underpinnings is crucial for effective management.
  • Botulinum toxin therapy offers a targeted and effective treatment for managing symptoms.