What is the primary source of blood flow to the hand?

The primary source of blood flow to the hand is the ulnar artery. The ulnar artery branches from the brachial artery in the upper arm and travels down the forearm, supplying blood primarily to the medial (ulnar) side of the hand. It plays a crucial role in the circulation of the hand by contributing significantly to the formation of the superficial and deep palmar arches, which further distribute blood to the fingers.

The ulnar artery, along with the radial artery, forms the palmar arches in the hand. These arches are critical for providing the necessary blood supply to the fingers during activities that require fine motor skills. While the radial artery is also important and does supply the lateral (radial) side of the hand, the ulnar artery's contributions are particularly vital for the overall perfusion and functionality of the hand.

The brachial artery serves as the main blood supply for the upper arm, but its contribution to the hand is indirect as it branches off into the radial and ulnar arteries. The palmar arch, though essential for finger perfusion, relies on the ulnar artery for its primary source of flow, making the ulnar artery the fundamental pathway that directly influences blood supply to