Differentiating features of UMN and LMN disease
Feature | Upper Motor Neuron Lesion | Lower Motor Neuron Lesion |
---|---|---|
Site of the lesion | Cerebral hemispheres, cerebellum, brainstem, spinal cord | Anterior horn cell, nerve roots, peripheral nerves, neuromuscular junction, muscles |
Muscle weakness | Quadriplegia, hemiplegia, diplegia, paraplegia | Proximal (myopathy) Distal (neuropathy) |
Muscle tone | Spasticity, rigidity | Hypotonia |
Fasiculations | Absent | Present (particularly tongue) |
Tendon reflexes | Hyperreflexia | Hypo/areflexia |
Abdominal reflexes | Absent (depending on the involved spinal level) | Present |
Sensory loss | Cortical sensations | Peripheral sensations |
Electromyography (EMG) | Normal nerve conduction Decreased interference pattern and firing rate | Abnormal nerve conduction Large motor units Fasciculations and fibrillations |
Note. Reprinted from “Concise outline of the nervous system examination for the generalist,” by Jan MM, Al-Buhairi AR, Baeesa SS. Neurosciences (Riyadh). 2001;6:16–22 (https://nsj.org.sa/content/6/1/16). CC BY-NC.
I extend sincere gratitude to my supervisor for their unwavering support, invaluable guidance, and scientific insight, which significantly improved this paper. Their constructive feedback enriched my research skills. I’m also deeply thankful to my boss for their leadership and patience. Their belief in my capabilities encouraged me to overcome challenges and focus on my research goals. Their invaluable contributions were key to the success of this research. Any recognition this paper receives is a testament to their dedication and guidance.
YS: Conceptualization, Investigation, Writing—original draft.
The author declares that he has no conflicts of interest.
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This study was partially supported by the Juntendo Research Branding Project, JSPS KAKENHI I grant no. [21K07690, 21K12153, 22H04926]; a Grant-in-Aid for Special Research in Subsidies for ordinary expenses of private schools from The Promotion and Mutual Aid Corporation for Private Schools of Japan; the Brain/MINDS Beyond program grant no. [JP19dm0307101] of the Japan Agency for Medical Research and Development (AMED), under grant no. [JP21wm0425006]. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
© The Author(s) 2023.