This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy, Subject name: Anatomy
What is the extent of spinal cord in an adult? 
Select and explain. 
A. Lower border of L1, B. Tip of Coccyx, C. Upper border of L3, D. S2
A: Lower border of L1
Answer: A: Lower border of L1 
Explanation: Ans. is 'a' i.e., Lower border of LI * Spinal cord begins at foramen magnum and, in adults, ends at lower border of LI.StructureExtends uptoAdult spinal cordInfant spinal cordLower border of L} or upper border of L2Upper border of L3 vertebraeFilum terminalePiamaterTip of coccyxDural sheathSubdural spaceSub arachnoid spaceS2 vertebra