Its tendon forms the anterior border of the anatomical snuffbox.

(Accordingly, the anatomical snuffbox is most visible, having a more pronounced concavity, during thumb extension.)

He appeared to be reading his palms: the heart line, head line, lifeline - and the many meaningful lines radiating out of the web between thumb and forefinger, that area known as the anatomical snuffbox.

Mom was never interested solely in the heart line, head line, and lifelines, but equally in the anatomical snuffbox, the interdigital pads, the heel of the hand, the thenar eminence, and the hypothenar.

The cephalic vein arises within the anatomical snuffbox, while the dorsal cutaneous branch of the radial nerve can be palpated by stroking along the extensor pollicis longus with the dorsal aspect of a fingernail.

The area affected is typically on the back or side of the hand at the base of the thumb, near the anatomical snuffbox, but may extend up the back of the thumb and index finger and across the back of the hand.

Deep to the tendons which form the borders of the anatomical snuff box lies the radial artery, which passes through the anatomical snuffbox on its course from the normal radial pulse detecting area, to the proximal space in between the first and second metacarpals to contribute to the superficial and deep palmar arches.