This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Structures descending through foramen magnum are all except: 
Select and explain. 
A. Lower part of medulla., B. Tonsils of cerebellum., C. Membrana tectoria., D. Anterior and posterior spinal arteries.
C: Membrana tectoria.
Answer: C: Membrana tectoria. 
Explanation: None