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
Root value for nerve to Quadratus femoris ? 
Select and explain. 
A. L1,L2,L3, B. L2,L3,L4, C. L4,L5 ,S1, D. S1, S2,S3
C: L4,L5 ,S1
Answer: C: L4,L5 ,S1 
Explanation: Ans. C. L4,L5 ,S1The nerve to quadratus femoris arises from the anteriordivisions of the sacral plexus.It is formed from the L4-S1 nerve roots and exits the pelvis the greater sciaticforamen inferior to the piriformis muscle and deep to thesciatic nerve.