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Parkinson Disease l: Introduction

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...

Parkinson's Disease: Treatment

Parkinson'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 Disease ll: Pathophysiology

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...

Parkinson's Disease: Overview

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...

Alterations in Muscle Tone lll

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...

Alterations in Muscle Tone ll

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...

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Related Experiment Video

Updated: Jun 29, 2026

Induction and Assessment of Levodopa-induced Dyskinesias in a Rat Model of Parkinson's Disease

Induction and Assessment of Levodopa-induced Dyskinesias in a Rat Model of Parkinson's Disease

Published on: October 14, 2021

[Atypical parkinsonism].

Ole-Bjørn Tysnes¹, Steinar T Vilming

¹Nevrologisk avdeling, Haukeland Universitetssykehus, 5021 Bergen. obty@haukeland.no

Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke

|October 11, 2008

Summary

Atypical parkinsonism presents with symptoms similar to Parkinson's disease but has different causes and often lacks typical resting tremor. Early diagnosis and alternative treatments are crucial for managing these complex neurological conditions.

Area of Science:

Neurology
Neuroscience
Pathology

Context:

Parkinson's disease (PD) involves dopamine deficiency, leading to motor symptoms like tremor and rigidity.
Atypical parkinsonism shares symptoms with PD but stems from diverse causes, affecting about one-third of cases.
Neuropathologically, PD is linked to nigro-striatal dopaminergic neuron loss and Lewy bodies, while atypical parkinsonism involves other brain regions.

Purpose:

To review current knowledge on non-PD diseases that induce parkinsonism.
To examine the clinical characteristics of atypical parkinsonism.
To explore diagnostic improvements and alternative treatment strategies for atypical parkinsonism.

Summary:

Atypical parkinsonism typically presents with symmetric symptoms, often without the characteristic resting tremor of PD, though corticobasal degeneration is an exception.

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Rating L-DOPA-Induced Dyskinesias in the Unilaterally 6-OHDA-Lesioned Rat Model of Parkinson's Disease

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Published on: October 4, 2021

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Last Updated: Jun 29, 2026

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Implantation of Osmotic Pumps and Induction of Stress to Establish a Symptomatic, Pharmacological Mouse Model for DYT/PARK-ATP1A3 Dystonia

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Rating L-DOPA-Induced Dyskinesias in the Unilaterally 6-OHDA-Lesioned Rat Model of Parkinson's Disease

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Published on: October 4, 2021

Key differentiating symptoms include early falls, postural dizziness, coordination issues, and rapid cognitive decline.

The review covers clinical features, diagnostic aids, and alternative therapeutic approaches for atypical parkinsonism.

Impact:

Enhances understanding of conditions mimicking Parkinson's disease.
Provides insights into differential diagnosis between PD and atypical parkinsonism.
Informs clinical practice regarding diagnosis and management of parkinsonian syndromes.