Lesson on differences between Upper and Lower Motor Neuron Lesions. Upper motor neurons (UMN) are located within the brain and brainstem and send their axons down the spinal cord to innervate lower motor neurons (LMN). Lower motor neurons (LMN) are located within the ventral horn of the spinal cord and send their axons towards the periphery to innervate skeletal muscles. Lesions in upper and lower motor neurons have characteristic differences.

In this lesson you will learn what upper motor neurons and lower motor neurons are, where they are located in the central nervous system and what happens when their is a lesion or damage to them. You will also learn the reason for the characteristic differences between lesions in UMN and LMN.

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JJ

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**MEDICAL DISCLAIMER**: JJ Medicine does not provide medical advice, and the information available on this channel does not offer a diagnosis or advice regarding treatment. Information presented in these lessons is for educational purposes ONLY, and information presented here is not to be used as an alternative to a healthcare professional’s diagnosis and treatment of any person/animal.

Only a physician or other licensed healthcare professional are able to determine the requirement for medical assistance to be given to a patient. Please seek the advice of your physician or other licensed healthcare provider if you have any questions regarding a medical condition.

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JJ

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