This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscles of arm and forearm region & Cubital fossa, Subject name: Anatomy
Pronator quadratus has same innervation as following muscles- 
Select and explain. 
A. Flexor pollicis longus, B. Flexor digitorum superficialis, C. Palmaris longus, D. Flexor carpi ulnaris
A: Flexor pollicis longus
Answer: A: Flexor pollicis longus 
Explanation: Pronator quadratus is supplied by anterior interosseous nerve which is a branch of median nerve. This anterior interosseous nerve supplies deep muscles of anterior forearm: Flexor pollicis longus Lateral half of Flexor digitorum profundus of index & middle fingers Pronator quadratus. Flexor digitorum superficialis supplied by median nerve Palmaris longus supplied by median nerve Flexor carpi ulnaris supplied by ulnar nerve