Left Tongue Deviation caused by UMN XII palsy Looks can be deceiving. The UMN innervation of most cranial nerves is bilateral which means that each cranial nerve receives impulses from the left and right hemisphere. Exceptions to this rule are CN 5,7 &12. Although at first glance it looks like a left LMN XII n palsy , the preserved movements to either side inspite of deviation on protrusion is suggestive . CT brain ⬇️ Dx- UMN XII nerve palsy. Lesion - infarction right subcortex. Dr. Boby Varkey Maramattom @bobvarkey #Left #Tongue #Deviation #UMN #CNXII #palsy #clinical #video #hypoglossal #physicalexam #neurology
