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.
Learn more about the rarest & most valuable sports cards in the cards collecting market. Rarity is a factor that greatly increases the sports cards values. Generally speaking, rare sports cards are the ones with the highest price in the market provided that they are in demand by many sports memorabilia collectors. Here are the top ten most valuable sports cards of all time. The list is composed of vintage baseball cards which are significant in the sports trading cards history and remain to be sought-after even by modern sports cards collectors. 1. 1954 Bowman #66A Ted Williams.