Anatomical Structures of the Hand, Dorsal View

Description

Dorsal anatomy of the male hand and distal forearm is rendered from the carpus through the metacarpus to the phalanges, with the extensor digitorum tendons fanning distally into the extensor expansions over the proximal and middle phalanges. Proximal to the wrist, the extensor carpi radialis longus and brevis tendons course on the radial side, while extensor carpi ulnaris tracks along the ulnar border; the extensor pollicis longus crosses obliquely toward the thumb and, with extensor pollicis brevis and abductor pollicis longus, frames the anatomic snuffbox laterally. Dorsal digital nerves and the superficial venous network run superficially over the metacarpals, with arterial branches traveling deeper toward the dorsal metacarpal arteries and dorsal digital vessels. Clear layering matters here. That dorsal perspective is the one clinicians use to orient extensor tendon zones (I to VII) and to teach why lacerations over the metacarpophalangeal joints can evolve into sagittal band disruption and extensor tendon subluxation. It also maps directly onto de Quervain tenosynovitis in the first dorsal compartment and intersection syndrome where abductor pollicis longus and extensor pollicis brevis cross extensor carpi radialis longus and brevis in the distal forearm, two entities that look similar clinically but differ in their pain locus and treatment. Venous and cutaneous nerve trajectories explain common iatrogenic hazards during dorsal wrist arthroscopy portals and ganglion excision. Use this plate in upper-limb anatomy teaching for extensor mechanism organization, in hand surgery atlases for dorsal approaches to the wrist and metacarpals, or in emergency medicine materials on tendon laceration assessment and repair planning by zone. It also fits radiology education when correlating dorsal soft tissues with ultrasound of the extensor compartments and MRI of the extensor hood. Anatomical accuracy verified by SciePro's Medical Advisory Board.