marrow: the fatty network of connective tissue that fills the cavities of bones
connective tissue: tissue of mesodermal origin consisting of e.g. collagen fibroblasts and fatty cells; supports organs and fills spaces between them and forms tendons and ligaments
first lateran council: the first council of the Western Church held in the Lateran Palace in 1123; focused on church discipline and made plans to recover the Holy Lands from the Muslim `infidels'