sobia naeem
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can anyone tell abt the symptoms of this pseudobulbar palsy and how it occurs?
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| ssrpk
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hi,
cranial nerves are unique in the sense tht UMN's [cortico-bulbar tract] supplies LMN's on both sides with few exceptions i.e- LMN's of facial nerve tht supplies the lower half of the face and in some individuals hypoglassal nerve! (receving innervation from only contralateral neurons)
therefore lseions in only one sided cortico-bulbar tract will result in paralysis of only lower half of the face on the contralateral side! [psedo-bulbar palsy]
correct me if i am wrong!
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| sobia naeem
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well u r partly right..it is upper motor neuron lesion involving muscles of eating,swallowing and talking due to bilateral lesion above the mid pons.tongue is spastic,jaw jerk is increased and speech is like donald duck...usually caused by strokes and affects bilaterally.......
well now another one lil question what is bulbar palsy.????
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| ssrpk
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hmmmmmm......is it due to bilateral lesion of UMN' residing in corticobulbar tract??
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| sobia naeem
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well bulbar palsy is due to loss of function of brainstem motor nuclei..so it exhibits lower mototr neuron lesion features like flaccid fasiculating tongue,jaw jerk is absent,plus palsy of chewing,swallowing and facial muscles and also some voice changes.....the causes include guillian barre,polio,brain stem tumours.......
confusing isnt it!!!!pseudobulbar shows upper motor neuron lesion affects and bulbar palsy shows lower motor neuron lesion affects...
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| ssrpk
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oh.....thnx 
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| 9527
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one of the reason for pseudobulbar palsy is alcholism or fast correction of hyponatrinemia.....both of them can cause myelinolysis of corticalbulbar tract in pontine area...
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