The classification pays attention to cell lineages, intercellular substance structure, functional determination, and tissue localization within the body.

• Hematopoietic tissues are found in the hematopoietic organs; formed elements of the blood and lymph are produced and differentiated there
• Connective tissues proper are the most common in the body; they differ in the proportion of ground amorphous substance and fiber content, as well as fiber orientation within the intercellular substance
• Connective tissues with special properties are formed by agglomerations of specialized connective tissue cells; they differ by their intercellular substance volume and content
• Supporting connective tissues are marked by a high density of their intercellular substance; they constitute the body skeleton (so they are also called skeletal). These tissues also include dentine and cementum of teeth.