The ulnar artery, ulnar nerve, and tendon of the palmaris longus pass into the hand anterior to the flexor retinaculum and therefore do not pass through the carpal tunnel (Fig. 7.98). The tendon of the palmaris longus is not surrounded by a synovial sheath.
The radial artery passes dorsally around the lateral side of the wrist and lies adjacent to the external surface of the scaphoid.