A hollow at the back of the proximal aspect of the thumb, more clearly seen when the thumb is hyperextended. It is bounded laterally by the abductor pollicis longus and extensor pollicis brevis tendons and medially by the extensor pollicis longus  tendon. Its floor is made up in a proximodistal fashion, by the scaphoid, trapezium and the head of the first metacarpal bone.

It contains the radial artery as it passes between the two heads of the 1st dorsal interosseous muscle.

  
1 posterior border- abductor pollicis brevis and extensor pollicis brevis tendons; 2 extensor pollicis longus

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