<prompt> Medial boundary of the anatomical snuffbox is formed by:Extensor pollicis brevisExtensor carpi radialis longusExtensor pollicis longusExtensor carpi radialis brevis  <response>: Anatomical snuff box is lined posteromedially - extensor Pollicis longus Anterolaterally - 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. 