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 three outer membranes (the
meninges) that envelop the
brain and
spinal cord are composed of connective tissue.