What two muscles form the borders of the anatomical snuff box?

The anatomical snuff box is a triangular depression on the radial side of the wrist, formed by specific muscle tendons. The correct choice highlights the extensor pollicis longus and extensor pollicis brevis as being responsible for the borders of this structure.

The extensor pollicis longus courses along the posterior aspect of the forearm and wraps around the wrist to help extend the thumb. It is located on the ulnar side of the snuff box. On the opposite side, the extensor pollicis brevis lies adjacent and aids in extending the proximal phalanx of the thumb. Together, these two tendons create the defined lateral and medial boundaries of the anatomical snuff box.

Understanding the anatomy and function of these muscles provides insights into wrist and thumb movements and can aid in clinical assessments related to wrist injuries. Knowing their location is crucial for evaluating conditions such as scaphoid fractures, which can involve this anatomical region.