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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...
Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
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...
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...
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...

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Related Experiment Video

Updated: May 10, 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

Secondary and primary dystonia: pathophysiological differences.

Maja Kojovic1, Isabel Pareés, Panagiotis Kassavetis

  • 1Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, University College London, WC1N 3BG, London, UK. maja.kojovic.09@ucl.ac.uk

Brain : a Journal of Neurology
|June 18, 2013
PubMed
Summary
This summary is machine-generated.

Primary dystonia involves increased cortical plasticity and reduced cerebellar function, unlike secondary dystonia which shows normal plasticity and cerebellar function. This suggests different mechanisms underlie these dystonia types.

Keywords:
brain plasticitycerebellumdystoniasensorimotor cortextranscranial magnetic stimulation

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Last Updated: May 10, 2026

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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:

  • Neuroscience
  • Movement Disorders
  • Clinical Electrophysiology

Background:

  • Primary dystonia is often linked to basal ganglia dysfunction, but its exact pathophysiology remains unclear.
  • Secondary dystonia, caused by brain lesions, presents similar symptoms but may have different underlying mechanisms.
  • Previous research suggests motor system deficits and enhanced plasticity in primary dystonia, with emerging evidence for cerebellar involvement.

Purpose of the Study:

  • To compare electrophysiological features of primary and secondary dystonia to determine if their symptoms share common pathophysiological mechanisms.
  • To investigate motor cortex plasticity and cerebellar function in both dystonia types using transcranial magnetic stimulation and eye blink conditioning.

Main Methods:

  • Compared transcranial magnetic stimulation (TMS) measures (motor thresholds, input/output curves, short interval intracortical inhibition, cortical silent period) and paired associative stimulation (PAS) for plasticity in 11 secondary dystonia patients, 10 primary dystonia patients, and 10 controls.
  • Assessed cerebellar function in secondary dystonia patients using a delayed eye blink classical conditioning paradigm, comparing results with previously obtained data from primary dystonia patients.

Main Results:

  • No significant differences were found in motor thresholds, input/output curves, or cortical silent period between the groups.
  • Secondary dystonia patients exhibited reduced short interval intracortical inhibition on the affected side but normal plasticity and eye blink conditioning.
  • Primary dystonia patients demonstrated increased cortical plasticity and reduced eye blink conditioning compared to controls and secondary dystonia patients.

Conclusions:

  • Abnormally enhanced cortical plasticity is not essential for dystonia manifestation, as seen in secondary dystonia.
  • Normal eye blink conditioning in secondary dystonia suggests no significant cerebellar dysfunction in this form of dystonia.
  • Reduced short interval intracortical inhibition in secondary dystonia may stem from basal ganglia output changes or maintaining abnormal postures, highlighting diverse pathophysiological states in dystonia.