The median artery was not caught in the act of “evolving,” either in the micro- or macro- sense. It has been caught in the act of “persisting.”
Watch an acrobat performing on the parallel bars. Or a baseball player pitching a fastball. Or an athlete swimming the butterfly.
Researchers say a growing number of adults have a persistent, prominent median artery in their arms, an artery that’s important in the embryonic stage.
Scientists in Australia have uncovered that more adults now possess a “median artery of the forearm,” contrasted with studies over the past two centuries.