Motor Neuron and Motor Pathways
Preview this topic section
Each condition includes a free overview and clinical definition. Plans unlock the full Step 1 details.
Motor Neuron and Motor Pathways conditions
Amyotrophic Lateral SclerosisAmyotrophic Lateral Sclerosis is a progressive neurodegenerative disease causing motor neuron loss, muscle weakness, and eventual paralysis.Lower Motor Neuron LesionLower motor neuron lesion causes flaccid paralysis and muscle atrophy due to damage of anterior horn cells or peripheral nerves, often presenting with fasciculations.Spinal Muscular AtrophySpinal Muscular Atrophy is a genetic disorder causing progressive muscle weakness due to SMN1 gene mutations leading to motor neuron loss.Upper Motor Neuron LesionUpper Motor Neuron Lesion involves damage to motor pathways in the brain or spinal cord causing spastic paralysis, hyperreflexia, and positive Babinski sign.