This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
Deep flexors of forearm are supplied by 
Select and explain. 
A. Median nerve, B. Ulnar nerve, C. Radial nerve, D. Musculocutaneous nerve
B: Ulnar nerve
Answer: B: Ulnar nerve 
Explanation: Deep flexors of forearm are Flexor digitorum profundus, Flexor pollicis longus, and Pronator quadratus. Flexor digitorum medial half is supplied by Ulnar nerve and lateral half is supplied by the anterior interosseous nerve. Flexor pollicis longus and pronator quadratus are supplied by anterior interosseous nerve. REF:B D Chaurasia edition 7th page no:110.