Cranial Nerve 12 Dysfunction: Stroke has resulted in loss of function of left CN 12. When patient sticks tongue out, it therefore deviates to the left. Charlie Goldberg, M.D. - UCSD Catalog of Clinical Images #Clinical #Photo #CN12 #Palsy #CranialNerve12 #Tongue #Hypoglossal #UCSDH #CNXII #Deficit