This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb : Miscellaneous, Subject name: Anatomy
An X ray of thewrist and handin given below . If there is a damage to structureE, Which of the following muscle weakness does it cause ? 
Select and explain. 
A. Flexor carpi radialis, B. Palmaris longus, C. Flexor carpi ulnaris, D. Brachioradialis
C: Flexor carpi ulnaris
Answer: C: Flexor carpi ulnaris 
Explanation: The hook of hamate and the pisiform provide inseion for the flexor carpi ulnaris. Also note- If the floor of anatomic snuff box and origin of abductor pollicis brevis are damaged, bones most likely to be involved is B i.e. scaphoid forms the floor of the anatomic snuffbox and provides a site for origin of the abductor pollicis brevis.