Fig. 3. (A) Left hand showing prominent dorsal metacarpal vein (1) in the second metacarpal space between the second and third metacarpophalangeal joints. (B) Right hand showing prominent dorsal metacarpal vein (1) in the third metacarpal space between the third and fourth metacarpophalangeal joints. (C) Left hand showing prominent dorsal metacarpal vein (1) in the fourth metacarpal space between fourth and fifth metacarpophalangeal joints. (D) Left hand showing two short dorsal metacarpal veins (1) and (2) unite to form one prominent dorsal metacarpal vein (3) parallel to the extensor digitorum tendon of the fourth digit (ring finger). (E) Left hand showing two prominent dorsal metacarpal veins, one vein (1) in the second metacarpal space, between the second and third metacarpophalangeal joints and another vein (2) in the third metacarpal space between the third and fourth metacarpophalangeal joints. (F) Left hand showing two prominent dorsal metacarpal veins, one vein (1) in the third metacarpal space between third and fourth metacarpophalangeal joints and another vein (2) in fourth metacarpal space between fourth and fifth metacarpophalangeal joints.