 The condition is usually caused by the bilateral damage to corticobulbar pathways, which are upper motor neuron pathways that course from the cerebral cortex to nuclei of cranial nerves in the brain stem.Pseudobulbar palsy is the result of damage of motor fibers traveling from the cerebral cortex to the lower brain stem.This damage might arise in the course of a variety of neurological conditions that involve demyelination and bilateral corticobulbar lesions.