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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...

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Related Experiment Video

Updated: Jul 10, 2026

Measurement &amp; 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

Microstructural white matter changes in primary torsion dystonia.

Maren Carbon1, Peter B Kingsley, Chengke Tang

  • 1Center for Neurosciences, The Feinstein Institute for Medical Research, North Shore-Long Island Jewish Health System, Manhasset, New York 11030, USA. mcarbon@nshs.edu

Movement Disorders : Official Journal of the Movement Disorder Society
|November 14, 2007
PubMed
Summary

Primary torsion dystonia (PTD) involves widespread motor pathway damage, not just the basal ganglia. Diffusion tensor magnetic resonance imaging (DT-MRI) revealed reduced white matter integrity in PTD patients.

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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
09:33

Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases

Published on: July 28, 2013

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Last Updated: Jul 10, 2026

Measurement &amp; 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

Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
09:33

Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases

Published on: July 28, 2013

Area of Science:

  • Neuroscience
  • Neurology
  • Neuroimaging

Background:

  • Primary torsion dystonia (PTD) has traditionally been viewed as a basal ganglia disorder.
  • Emerging evidence suggests PTD may involve broader motor control pathways.
  • Understanding the anatomical basis of PTD is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate anatomical connectivity within motor control pathways in PTD patients.
  • To determine if PTD is associated with white matter abnormalities.
  • To explore the potential role of cerebello-thalamo-cortical pathway disturbances.

Main Methods:

  • Diffusion tensor magnetic resonance imaging (DT-MRI) was employed to assess white matter microstructure.
  • Fractional anisotropy (FA) was measured as an indicator of axonal integrity and coherence.
  • Analysis focused on white matter regions within the brainstem and sensorimotor areas.

Main Results:

  • PTD patients exhibited significantly reduced fractional anisotropy (FA) in the pontine brainstem near the left superior cerebellar peduncle.
  • Bilateral reductions in FA were observed in the white matter of the sensorimotor region in PTD patients.
  • These findings indicate widespread white matter microstructural abnormalities in PTD.

Conclusions:

  • The study supports the hypothesis that PTD involves disturbances in cerebello-thalamo-cortical pathways.
  • Abnormal anatomical connectivity may underlie the clinical symptoms of PTD.
  • DT-MRI is a valuable tool for identifying white matter pathology in movement disorders.