What structures form the posterior border of the anatomical snuffbox?

The posterior border of the anatomical snuffbox is formed by the tendon of the extensor pollicis longus (EPL). This tendon runs along the dorsal aspect of the wrist and is responsible for the extension of the thumb. It is a key anatomical feature in the snuffbox, which is a triangular depression found at the base of the thumb.

Understanding the anatomy of the snuffbox is important in clinical practice, especially when considering conditions related to wrist pathology or fractures. The EPL's position is crucial as it helps in identifying the anatomical snuffbox during physical examinations. In addition to the posterior border, the snuffbox also features other important structures, including the radial artery located within the snuffbox and the tendons of the extensor pollicis brevis and abductor pollicis longus forming the anterior border.

In this context, recognizing the role of the EPL tendon clarifies its importance in both anatomy and clinical evaluations.