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Other Terms: Retinaculum extensorum of hand, Extensor retinaculum of hand, Retinaculum musculorum extensorum manus
The extensor retinaculum is strong oblique fibrous band in the fascia of the distal forearm. It attaches to the lateral border of the radius and crosses to attach to the triquetral and pisiform bones of the wrist. As it crosses the posterior surface of the radius it binds to elevations on the bone and forms six tunnels that transmit tendons beneath it and into the wrist and hand. These tunnels are lined with synovial tendon sheaths that protect the extensor tendons from excess friction.
Retinaculum musculorum extensorum manus