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Muscle overactivity and movement dysfunction in the upper motoneuron syndrome
Nathaniel H Mayer1, Alberto Esquenazi
1Department of Physical Medicine and Rehabilitation, Temple University Health Sciences Center, Broad Street, Philadelphia, PA 19140, USA. nmayer@einstein.edu
Physical Medicine and Rehabilitation Clinics of North America
|October 29, 2003
Summary
Upper motoneuron syndrome (UMN) involves corticospinal system lesions, causing positive (overactivity) and negative (impaired function) motor signs. These symptoms significantly reduce patient mobility and limb use.
Area of Science:
- Neurology
- Neuroscience
- Motor Control
Background:
- Upper motoneuron syndrome (UMN) describes motor disorders arising from damage to the descending corticospinal pathways.
- Lesions can impact the cortex, internal capsule, brain stem, or spinal cord, affecting motor neuron function.
- UMN is characterized by both 'positive' (e.g., muscle overactivity) and 'negative' (e.g., impaired activation) clinical signs.
Purpose of the Study:
- To provide a comprehensive overview of upper motoneuron syndrome.
- To elucidate the classification and clinical manifestations of UMN.
- To highlight the functional impact of UMN on patients.
Main Methods:
- Review of existing literature on upper motoneuron syndrome.
- Classification of clinical features into positive and negative phenomena.
- Analysis of the impact of UMN on motor behavior and functional capacity.
Main Results:
- UMN results from lesions in the corticospinal system at various levels.
- Clinical features include positive signs (muscle overactivity) and negative signs (impaired motor control and performance).
- The syndrome broadly limits functional capacity, reducing mobility and limb usage.
Conclusions:
- Upper motoneuron syndrome encompasses a range of motor deficits due to corticospinal tract damage.
- Distinguishing between positive and negative signs is crucial for understanding UMN.
- UMN significantly impairs patient function, leading to reduced mobility and restricted limb use.