Progressive bulbar palsy is a progressive motor 1. neuron disease that affects only the muscles supplied by bulbar motor nuclei and the corticobulbar pathways. To the extent that both upper and lower motor neuron defi cits are discerned, ALS can be diagnosed as above. Flail arm syndrome (Vulpian Bernhard syn2. drome) and Flail leg syndrome begin with asymmetric defi cits of the arms or legs. Wh...
