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Related Concept Videos

Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

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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...
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Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

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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...
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Parkinson Disease l: Introduction01:24

Parkinson Disease l: Introduction

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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...
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Parkinson's Disease: Treatment01:24

Parkinson's Disease: Treatment

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Neurodegenerative disorders, such as Parkinson's Disease (PD), involve the gradual and irreversible destruction of neurons in particular brain areas. These disorders exhibit standard features like proteinopathies, selective vulnerability of some neurons, and an interaction of intrinsic properties, genetics, and environmental influences in neural injury.
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of...
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Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

29
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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Neural Regulation01:37

Neural Regulation

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Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
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Related Experiment Video

Updated: May 3, 2026

The 6-hydroxydopamine Rat Model of Parkinson's Disease
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Parkinson disease subtypes.

Mary Ann Thenganatt1, Joseph Jankovic1

  • 1Parkinson's Disease Center and Movement Disorders Clinic, Department of Neurology, Baylor College of Medicine, Houston, Texas.

JAMA Neurology
|February 12, 2014
PubMed
Summary
This summary is machine-generated.

Parkinson disease (PD) is a complex disorder with identified subtypes, like tremor-dominant and gait-difficulty forms. Further research is needed to understand the underlying mechanisms and develop subtype-specific biomarkers for better diagnosis and treatment.

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Assessment of Sensorimotor Function in Mouse Models of Parkinson's Disease
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Last Updated: May 3, 2026

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Assessment of Sensorimotor Function in Mouse Models of Parkinson's Disease
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Assessment of Sensorimotor Function in Mouse Models of Parkinson's Disease

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Area of Science:

  • Neurodegenerative Disorders
  • Neurology
  • Genetics

Background:

  • Parkinson disease (PD) is increasingly recognized as a heterogeneous disorder, not a single clinical entity.
  • Clinicopathologic heterogeneity in PD suggests distinct underlying pathogenic mechanisms.

Purpose of the Study:

  • To systematically review existing evidence supporting the differentiation of Parkinson disease into distinct subtypes.
  • To evaluate clinical, imaging, genetic, and pathologic findings related to PD subtypes.

Main Methods:

  • A systematic literature review was conducted using PubMed, covering articles published between 1980 and 2013.
  • Search terms included "Parkinson disease," "parkinsonism," "tremor," "postural instability and gait difficulty," and "Parkinson disease subtypes."
  • The final reference list was curated based on originality and relevance to the review's scope.

Main Results:

  • Several Parkinson disease subtypes have been identified, including tremor-dominant PD and postural instability gait difficulty (PIGD) forms.
  • These identified subtypes exhibit clustering of specific clinical features.
  • However, validation of these subtypes using specific biomarkers is still lacking.

Conclusions:

  • While distinct Parkinson disease subtypes exist, their underlying pathogenic mechanisms remain poorly understood.
  • Further investigation into subtype-specific diagnostic and prognostic biomarkers is crucial.
  • Identifying biomarkers will enhance understanding of neurodegeneration and improve clinical trial designs for PD.