Dorsal metacarpal veins

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Vein: Dorsal metacarpal veins
The veins on the dorsum of the hand.
Latin venae metacarpales dorsales
Gray's p.660
Source dorsal digital veins
Drains to dorsal venous network of hand
Artery dorsal metacarpal arteries

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 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.