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
Boundaries of anatomical snuff box are all except 
Select and explain. 
A. APL, B. EPL, C. EPB, D. ECU
D: ECU
Answer: D: ECU 
Explanation: The anatomical snuff box - It is a triangular depression which appears on the lateral side of the wrist. It is seen best when the thumb is extended. bounderies - It is bounded anteriorly - By the tendons of abductor pollicis longus and extensor pollicis brevis, and posteriorly - By the extensor pollicis longus. It is limited above by the styloid process of the radius and floor of snuff box is formed by the scaphoid and trapezium. Pulsations of the radial aery can be felt in the floor of the depression against the scaphoid and trapezium. Ref : B D Chaurasia's Human Anatomy , seventh edition , pg. no., 136