Extensor Retinaculum, Anterior View

Description

Across the anterior (dorsal) aspect of the wrist, the extensor retinaculum appears as a dense transverse band spanning from the distal radius laterally toward the ulna medially, lying superficial to the carpal bones and proximal metacarpal bases. Deep to this fascial thickening, the extensor tendons course distally toward the metacarpophalangeal joints and phalanges, aligned over the dorsal carpal rows. Underlying skeletal landmarks include the distal radius and ulna, the scaphoid and lunate proximally, and the capitate and hamate more centrally, with the metacarpals projecting distally into the hand. Compartmental routing is implied by the retinacular septa that tether tendon sheaths to bone. Functionally, this structure prevents bowstringing of the extensor tendons during wrist and finger extension, and its relationship to the dorsal radial and ulnar grooves explains common tenosynovitis patterns. A typical clinical correlation is de Quervain tenosynovitis within the first extensor compartment, where the abductor pollicis longus and extensor pollicis brevis pass adjacent to the radial styloid and may become painful with thumb motion. Surgical release of a constricted compartment demands respect for the septations and nearby superficial radial nerve branches. Small anatomy, big consequences. Use this plate to support upper-limb anatomy teaching on the osteofibrous tunnels of the wrist, tendon compartment organization, and surface landmarking for injections or surgical approaches. It also fits orthopedic and hand surgery texts discussing dorsal wrist pain, retinacular release, and extensor tendon pathology in the context of the carpal bones and joints. Anatomical accuracy verified by SciePro's Medical Advisory Board.