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
Roof of anatomical snuff box is formed by: 
Select and explain. 
A. Cephalic vein and superficial branch of radial nerve, B. Basilic vein and superficial branch of radial nerve, C. Cephalic vein and radial aery, D. Basilic vein only
A: Cephalic vein and superficial branch of radial nerve
Answer: A: Cephalic vein and superficial branch of radial nerve 
Explanation: - Roof of anatomical snuff box is by cephalic vein and superficial branch of radial nerve . - The pulse of the radial aeryis palpable in the floor of the snuffbox against scaphoid bone. - Boundries of Anatomical snuff box- Posteromedially (ulnar border) -extensor Pollicis longus Anterolaterally (radial border) -extensor pollicis brevis and abductor pollicis longus. Floor-scaphoid,trapezium,base of 1st metacarpal and styloid process of radius. Content - radial aery (Pulse can be felt by palpating radial aery against scaphoid bone).