Definition of Periosteum. It is a dense fibrous membrane made up of irregular connective tissue that covers the external surface of the bones. It is completely opposite to endosteum that lines the inner cavity of long bones.t mainly comprises of the following two layers: 1  Outer fibrous layer: It is composed of collagen-producing cells called fibroblasts and contains nerve fibers that cause pain when damaged due to the presence of nociceptive nerve endings.
Dealer Says He Doctored Most Valuable Baseball Card Ever Sold. A rare example of the 1909 Honus Wagner baseball card. In 2007, one of them fetched a whopping $2.8 million. A rare example of the 1909 Honus Wagner baseball card. In 2007, one of them fetched a whopping $2.8 million. A judge has rejected a plea agreement from the former head of a sports memorabilia auction house who admitted to using shill bidders to drive up prices and to altering the most valuable baseball card ever sold.
While rookie cards of other players connected with steroids have dropped out of sight, the 1984 Fleer Update Roger Clemens remains one of the most expensive rookie cards from the 1980s. It has a lot going for it, the main two being its limited availability and that it's Clemens' only 1984 card.