👉 The alto veins are a group of superficial veins that run along the sides of the fingers and toes, between the skin and the underlying tendons. They are named after the Italian anatomist Giovanni Battista Dini, who first described them in the 18th century. These veins are responsible for returning blood to the heart from the extremities and are often visible as thin, blue lines under the skin. Unlike deeper veins, alto veins are easily visible due to their close proximity to the surface of the skin.
