Before one closes this wound it is important to directly visualize the tendon and examine it for injury. If the tendon is more than 50% severed one should not attempt to repair it in the E.R. setting. Close the wound and immobilize the thumb, a surgeon can repair the tendon at a later date. BONUS ANSWER: The Anatomical Snuff-box is bordered by the Extensor Poll. Longus, Ext. Poll. Brevis and the Abductor Poll. Longus