[The development of pre- and post-natal veins].

Superficial and deep veins have different evolutions, structures and functions. Phylogenetically, superficial veins of limbs appear before the deep ones. In mammals other than man, both anatomical and histological abnormalities of superficial and deep veins have been noticed. In phlebology, the date of the first appearance of these veins was examined, from the infantile age to the age of 60 in 2,259 patients. Incomplete truncal varicose veins or an excess of certain perforating veins were found in 13.9% cases among children of school age. In 71.0% cases, these defects had a hereditary origin.