Cellular patterns and the composition of the matrix classify connective tissue. Table 2 lists the 4 categories of connective tissue in adults.
Table 2. Categories of Connective Tissue.| Category | Description |
| Connective tissue proper | The matrix is composed of collagen, elastin, and reticulin fibers, as well as adipose tissue. |
| Cartilage | The matrix is composed of a firm, gel-like matrix made up of water, collagen fibers, and chondrocytes. |
| Osseous tissue (bone) | Bone is comprised of a rigid, mineralized matrix of collagen fibers and osteocytes.
|
| Vascular tissue (blood) | The matrix is a liquid called plasma, which consists of red and white blood cells, leukocytes, and platelets. |
