Question

Upper motor neuron lesion and lower motor neuron lesion

Answer 1

An upper motor neuron lesion occurs in the neural pathway above the anterior horn cell of the spinal cord or motor nuclei of the cranial nerves. Conversely, a lower motor neuron lesion affects nerve fibres travelling from the anterior horn of the spinal cord or the cranial motor nuclei to the relevant muscles.
A lower motor neuron lesion is a lesion which affects nerve fibres travelling from the ventral horn or anterior grey column of the spinal cord to the relevant muscle(s) – the lower motor neuron. One major characteristic used to identify a lower motor neuron lesion is flaccid paralysis