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.
He started with the Association in 1966 as an outside counsel, joined the NBA in 1978 as General Counsel, and became the league's Executive Vice President in 1980. He became Commissioner in 1984, succeeding Larry O'Brien.