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
Roof of the Anatomical snuff box is formed by the 
Select and explain. 
A. Radial aery, B. Basilic aery, C. Sup branch of radial nerve, D. Sup branch of ulnar nerve
C: Sup branch of radial nerve
Answer: C: Sup branch of radial nerve 
Explanation: Anatomical snuff box boundaries: Lateral wall Abductor pollicis longus Extensor pollicis brevis Medial wall Extensor pollicis longus Roof Cephalic vein Sup branch of radial nerve Floor Radial styloid, scaphoid, trapezium,1st meta carpal Content Radial Aery Ref: Gray's Anatomy The Anatomical Basics of Clinical Practice 41 e pg 893.