Connective tissue (CT) is one of the four types of biological tissue that support, connect, or separate different types of tissues and organs in the body.The other three types are epithelial, muscle, and nervous tissue.Connective tissue is found in between other tissues everywhere in the body, including the nervous system. In the central nervous system the outer membranes, the meninges, that cover the brain and spinal cord are composed of connective tissue.ll connective tissue apart from blood and lymph consists of three main components: fibers (elastic and collagenous fibers), ground substance and cells. (Not all authorities include blood or lymph as connective tissue.) Blood and lymph lack the fiber component.