This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brainstem lesions and blood supply of CNS, Subject name: Anatomy
True statement about medial medullary syndrome? 
Select and explain. 
A. 3rd nerve palsy, B. 6th nerve palsy, C. I/L 12 th nerve palsy, D. I/L hemiplegia
C: I/L 12 th nerve palsy
Answer: C: I/L 12 th nerve palsy 
Explanation: C.N. nuclei involved in medial medullary syndrome is Hypoglossal nuclei (XII) Features of Medial Medullary Syndrome resulting from occlusion of the anterior spinal aery. I/L 12th nerve palsy - Tongue muscle palsy. C/L Spastic paralysis (pyramidal tract involved) Dorsal coloumn medial lemniscal system involved so loss of position sense, vibration and fine touch sensation on C/L side.