Which of the following wrist muscles can play a significant role in resisting valgus stress to the elbow?

a. Brachioradialis
b. Flexor carpi ulnaris
c. Extensor carpi radialis
d. Flexor carpi radialis

ANS: B
The flexor carpi ulnaris (FCU) is the only muscle to lie directly over the anterior portion of the medial collateral ligament (MCL) during elbow flexion. Due to its position, the FCU can assist in reinforcing the MCL when the elbow is flexed.