A bursa is a closed, fluid-filled sac that functions as a cushion and provide a gliding surface to reduce friction between tissues of the body around joints. Essentially, a bursa provides a slick surface so that tendons and ligaments can slide across a bony prominence so it doesn't catch or rub against the bone.
Mark Tatum's appointment as NBA Deputy Commissioner is recognition of the confidence our owners and teams have in his leadership ability and track record of success, said Silver.
a person commissioned to act officially; member of a commission. 2. a government official or representative in charge of a department or district: the police commissioner; the commissioner of a colony. 3. an official chosen by an athletic association to exercise broad administrative or judicial authority: the baseball commissioner.