1. The palmar carpal ligament lies superficial and proximal to the flexor retinaculum . 2. The opponens pollicis originates on the tubercle of the trapezium and the flexor retinaculum . 3. When surgery is needed, the flexor retinaculum is either completely severed or lengthened. 4. Here it is bound down by the flexor retinaculum in company with the posterior tibial artery. 5. The tarsal tunnel is delineated by bone on the inside and the flexor retinaculum on the outside. 6. The opponens pollicis originates from the flexor retinaculum of the hand and the tubercle of the trapezium. 7. The flexor retinaculum is continuous with the palmar carpal ligament, and deeper with the palmar aponeurosis. 8. Four long tendons come off this muscle near the wrist and travel through the carpal tunnel formed by the flexor retinaculum . 9. The fibers end in a flattened tendon, which passes beneath the flexor retinaculum of the hand through the carpal tunnel. 10. Superficial to the carpal tunnel and the flexor retinaculum , the ulnar artery and ulnar nerve pass through the ulnar tunnel.
