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
Not under flexor retinaculum 
Select and explain. 
A. Median nerve, B. Ulnar nerve, C. FDS, D. FPL
B: Ulnar nerve
Answer: B: Ulnar nerve 
Explanation: Structures deep to flexor retinaculum1) Lateral compament : Flexor carpi radialis tendon with its synol sheath lodged in the groove on the palmar surface of trapezium.2 Medial compament : (carpal tunnel proper).Structures superficially to flexor retinaculum 1) Palmaris longus tendon continuous with apex of palmar aponeurosis.2) Palmar cutaneous branch of median nerve.3) Palmar cutaneous branch of ulnar nerve.4) Ulnar nerve.5) Ulnar vessels protected superficially by volar carpal ligament (superficial pa of the flexor retinaculum).