Anatomical Location of the Interdigital Spaces of the Hand

Description

Seen from the dorsal aspect, the hand (manus) rests in anatomical position with the metacarpals and metacarpophalangeal (MCP) joints forming the bony framework beneath the skin, while the interdigital web spaces are marked between the thumb and index finger and between digits II to V. Bright blue bands delineate each commissure where the proximal phalanges diverge distally, and where the dorsal interossei occupy the intermetacarpal spaces deep to the extensor apparatus. Superficially, the dorsal skin creases and subtle contours of the extensor tendons align longitudinally toward the distal phalanges. Clean landmarks. Clear definition of interdigital spaces matters because web-space anatomy drives both function and deformity, from first web space adduction contracture after burns to congenital syndactyly where separation fails along these exact planes. Hand surgeons plan Z-plasty commissuroplasties and local flap designs by referencing the depth and boundaries of the web spaces relative to the metacarpal heads, and clinicians track dorsal hand infections and edema patterns that often spread through loose areolar tissue before limiting at fascial septa near the digits. The dorsal view also supports teaching of surface anatomy overlying the dorsal venous network and extensor compartments, structures that are frequently encountered during IV access, trauma assessment, and dorsal laceration repair. Ideal placements include gross anatomy labs covering upper limb surface anatomy, surgical education on web-space release and post-burn contracture reconstruction, and medical publishing on dermatologic conditions affecting interdigital regions (maceration, tinea, contact dermatitis) with accurate skin-of-color representation. It also suits patient-facing materials that need unambiguous, labeled localization for first through fourth web spaces on the back of the hand. Anatomical accuracy verified by SciePro's Medical Advisory Board.