Fig. 1. (A) Left hand showing long dorsal metacarpal veins (1) and (2), which neither bifurcate nor unite and continue to pass on the dorsum of the hand between the metacarpophalangeal joints. (B) Right hand showing the dorsal metacarpal veins (1), which bifurcate into two veins (2) and (3). (C) Right hand showing short dorsal metacarpal veins (1) and (2), which unite near their origin to form one long dorsal metacarpal vein (3). (D) Right hand showing two adjacent dorsal metacarpal veins (1) and (2), which unite away from their origin to form one short dorsal metacarpal vein (3). (E) Left hand showing two short dorsal metacarpal veins (1) and (2), which unite near their origin and form one long dorsal metacarpal vein (3) passes parallel to the corresponding extensor tendon. (F) Left hand showing dorsal metacarpal veins running in different directions and forming network of veins on the dorsum of the hand with no prominent vein.