<prompt> Bounderies of anatomical snuff box are all exceptAPLEPLEPBECU  <response>: Ans. is d i.e., ECU Anatomical Snuffbox Triangular depression on the dorsal and radial aspect of the hand become visible when thumb is fully extended. Boundaries MedialPosterior - Tendon of the extensor pollicis longus. LateralAnterior - Tendon of the extensor pollicis brevis and abductor pollicis longus. Roof Skin and - fascia with beginning of cephalic vein and crossed by superficial branch of the radial nerve. Floor - Styloid process of radius, trapezium, scaphoid and base of 1st metacarpal. Contents - The radial aery. 