Related Experiment Video
Updated: May 26, 2026
14:45
Analyzing the Parkinson's Disease Mouse Model Induced by Adeno-associated Viral Vectors Encoding Human α-Synuclein
Published on: July 29, 2022
Parkinson's disease tremor: pathophysiology.
1Human Motor Control Section, NINDS, NIH, Bethesda, MD 20892-1428, USA. hallettm@ninds.nih.gov
Parkinsonism & Related Disorders
|December 15, 2011
Summary
Parkinson's disease tremor originates not in the thalamus but is triggered by basal ganglia activating a cerebellar circuit. This basal ganglia-cerebellar interaction explains tremor generation, independent of dopamine levels.
Area of Science:
- Neuroscience
- Movement Disorders
Background:
- Parkinson's disease (PD) is characterized by tremors, notably tremor-at-rest and re-emergent tremor.
- These tremors are distinct from bradykinesia and rigidity, showing no direct correlation with dopamine deficiency or response to dopaminergic treatment.
Purpose of the Study:
- To investigate the neurophysiological basis of tremor generation in Parkinson's disease.
- To differentiate the roles of the basal ganglia, thalamus, and cerebellum in tremor pathophysiology.
Main Methods:
- Analysis of cellular activity coherence in basal ganglia nuclei and the VIM nucleus of the thalamus.
- Examination of tremor frequencies and phase locking across different body parts.
Main Results:
- Cellular activity in the VIM nucleus of the thalamus shows higher coherence with tremor than basal ganglia activity.
- Different body parts exhibit similar but not identical tremor frequencies, suggesting separate tremor generators.
- Thalamic cellular activity analysis indicates the thalamus is not the tremor generator.
Conclusions:
- Parkinson's disease tremor generation involves a circuit where basal ganglia trigger cerebellar activity.
- The thalamus is a relay nucleus, not the primary generator of tremor.
- Somatotopic segregation within basal ganglia loops may explain the independence of tremor in different body parts.
Related Concept Videos
01:24Parkinson 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...
01:24Parkinson 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...
01:15Parkinson'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...
01:24Parkinson's Disease: Treatment
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 its...
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of its...
01:11Alterations 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...
01:12Alterations 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...