The dorsal digital veins from the adjacent sides of the fingers unite to form three dorsal metacarpal veins, which end in a
dorsal venous net-work
The dorsal venous network of the hand is a network of veins within the superficial fascia on the dorsum (backside) of hand. It is formed by the dorsal metacarpal veins, and gives rise to veins such as the cephalic vein and the basilic vein
...
opposite the middle of the metacarpus.
They are a popular site for peripheral venous
cannulation because they tend to be prominent veins which are easily accessible and do not lie over a point of flexion - so are not too uncomfortable for the patient.
Veins of the upper limb
{{circulatory-stub