A 37yr man slipped while he was walking home and fell on his out stretched hand

A 37yo man slipped while he was walking home and fell on his out stretched hand. He complains
of pain in the right arm. XR showed fx of the head of radius. What is the single most associated
nerve injury?
a. Radial nerve
b. Musculocutaneous nerve
c. Median nerve
d. Ulnar nerve
Q. 1. What is the key?
Q. 2. What is the root value?
Ans. 1. The key is A. Radial nerve. [At wrist, radial nerve injury cause finger drop with a normal wrist and
intact sensation].
Ans. 2. Root value of radial nerve: C5,6,7,8 and T1.