The blood supply to the hand is by the radial and ulnar arteries, which form two interconnected vascular arches (superficial and deep) in the palm (Fig. 7.109). Vessels to the digits, muscles, and joints originate from the two arches and the parent arteries:
The radial artery contributes substantially to the supply of the thumb and the lateral side of the index finger.
The remaining digits and the medial side of the index finger are supplied mainly by the ulnar artery.