First Dorsal Metacarpal Artery, Posterior View

Description

Posterior to the first and second metacarpals, the first dorsal metacarpal artery courses distally through the dorsal first interosseous space, typically arising from the radial artery as it crosses the dorsum of the hand near the anatomical snuffbox. Dorsal venous channels accompany the arterial tree superficially, while deeper planes suggest the dorsal interossei and extensor apparatus overlying the metacarpal shafts and metacarpophalangeal joints. Radial and ulnar margins are oriented by the thumb and index rays, with the vessel running obliquely from proximal radial toward distal and slightly ulnar before giving branches toward the thumb and index finger. Small-caliber arterioles and paired venae comitantes may be indicated where the illustration transitions from named vessel to microvascular territory. A posterior view of the first dorsal metacarpal artery matters because it anchors surface and surgical anatomy around the dorsoradial hand, where the superficial branch of the radial nerve and the cephalic vein also traverse. Pedicled first dorsal metacarpal artery flaps for thumb pulp and dorsal thumb reconstruction depend on preserving this vessel as it passes between the heads of the first dorsal interosseous and adjacent fascial planes. A dependable landmark. Educators can drop this figure into upper limb anatomy teaching to clarify dorsal hand vascular patterns and to contrast dorsal metacarpal arteries with the palmar metacarpal system supplied by the deep palmar arch. Hand surgeons and plastic surgeons will find it suited for operative planning illustrations, flap design diagrams, and patient-facing consent materials that explain why dorsoradial incisions and dissections must respect the vascular pedicle and nearby sensory nerves. Anatomical accuracy verified by SciePro's Medical Advisory Board.