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.
Top 10 Most Valuable Basketball Cards. The most valuable basketball cards while not in the same league price-wise as other vintage sports cards are coming on strong for those who collect these cardboard depictions of hardwood heroes. Prices are soaring in the last decade for the Top 10 Most Valuable Basketball Cards. As in baseball and football cards, generally, a non-partisan third-party grader authenticates the most expensive basketball cards (usually this is Professional Sports Authority (PSA) or Sportscard Guaranty LLC (SGC)). Below are some of the most sought after basketball cards that the world has to offer.