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Related Concept Videos

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...
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 l: Introduction01:24

Parkinson Disease l: Introduction

Parkinson’s disease is a chronic, progressive neurodegenerative disorder that primarily affects movement. It is characterized by motor symptoms such as resting tremors, muscle rigidity, bradykinesia (slowness of movement), and postural instability. Patients may notice hand tremors at rest, stiffness during movement, or a shuffling gait. In addition to motor features, non-motor symptoms include sleep disturbances, mood and behavioral changes, constipation, and cognitive impairment, all of which...
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...
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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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 26, 2026

MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor
05:54

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Published on: December 13, 2017

Pathology in essential tremor.

Holly A Shill1, Charles H Adler, Thomas G Beach

  • 1Banner Sun Health Research Institute, Sun City, AZ, USA. holly.shill@bannerhealth.com

Parkinsonism & Related Disorders
|December 15, 2011
PubMed
Summary
This summary is machine-generated.

Essential tremor (ET) pathology shows reduced cerebellar Purkinje cells and locus ceruleus Lewy bodies. These findings link ET to cerebellar degeneration and Parkinson

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Histological Examination of Mitochondrial Morphology in a Parkinson's Disease Model
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Area of Science:

  • Neuroscience
  • Neuropathology

Background:

  • Essential tremor (ET) is a common neurological disorder.
  • The underlying pathology of ET is not fully understood.
  • Previous research suggests cerebellar involvement.

Purpose of the Study:

  • To review the current pathological findings in essential tremor.
  • To contextualize these findings within clinical ET studies.
  • To compare ET pathology with other neurodegenerative disorders like Parkinson's disease.

Main Methods:

  • Review of existing neuropathological studies in essential tremor.
  • Analysis of cerebellar degeneration markers.
  • Examination of locus ceruleus pathology, including Lewy bodies.

Main Results:

  • Consistent reduction in cerebellar Purkinje cells observed in ET.
  • Evidence of cerebellar degeneration in affected individuals.
  • Presence of restricted Lewy bodies in the locus ceruleus.

Conclusions:

  • Pathological findings support a neurodegenerative basis for essential tremor.
  • Cerebellar Purkinje cell loss and locus ceruleus pathology are key features.
  • These findings may help differentiate ET from other movement disorders.