Primary Lateral Sclerosis Home>Conditions_and_Diseases>Neurological_Disorders>Neurodegenerative_Diseases>Motor_Neuron_Disease>Primary Lateral Sclerosis     Web Pages Primary Lateral Sclerosis PLS information sheet compiled by the National Institute of Neurological Disorders and Stroke (NINDS). Primary Lateral Sclerosis - Emidicine.com Extensive article about primary lateral sclerosis (PLS). Motor Syndromes Brief facts about primary lateral sclerosis (PLS). Many other motor syndromes are laos mentioned.