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.
noun. 1  A member of a commission. 2  A person authorized by a commission to perform certain duties. 3  A governmental official in charge of a department: a police commissioner. 4  Sports An official selected by an athletic association or league to exercise administrative or regulatory powers over it: a baseball commissioner.