Extensor Digitorum Tendons Under the Skin, Posterior View

Description

Seen from the posterior aspect of an adult male hand and distal forearm, the extensor digitorum tendons run distally in parallel over the dorsum, superficial to the metacarpals and deep to the translucent skin. Proximally, the tendons converge toward the extensor retinaculum at the wrist, then diverge again as they course over the dorsal metacarpal region toward the extensor expansions at the fingers. A superficial dorsal venous network overlays this extensor compartment, with dorsal metacarpal veins and dorsal digital veins tracking longitudinally and obliquely between tendon intervals as they drain proximally toward the cephalic (radial) and basilic (ulnar) venous pathways. Bony contours of the metacarpals and phalanges sit deep as positional landmarks. That relationship matters in practice. Dorsal hand venipuncture and peripheral IV placement often target these superficial veins, and knowing where the extensor digitorum tendons lie helps avoid painful tendon injury or inadvertent cannulation adjacent to the extensor hood, where tethering can limit finger extension. Extensor tendon lacerations in dorsal hand trauma (classically in extensor zones V and VI over the metacarpals) can be subtle because the tendons remain aligned under intact skin, while the dorsal venous pattern and skin creases guide incision planning for tendon repair, synovectomy, or debridement in dorsal tenosynovitis. Hand anatomy courses, orthopaedic and plastic surgery teaching files, and emergency medicine procedure manuals often need a clear posterior map that integrates extensor tendons with the superficial venous drainage used for access. Use it in atlases, exam questions, patient education on dorsal hand injuries, or as a reference image in operative notes and procedural consent materials. Anatomical accuracy verified by SciePro's Medical Advisory Board.