the three categories of connective tissues are the three categories of connective tissues are connective tissue proper, fluid connective tissue, and supporting connective tissue. connective tissue proper, cartilage connective tissue, and bone connective tissue. epithelial connective tissue, muscle connective tissue, and neural connective tissue. glandular connective tissue, exocrine connective tissue, and endocrine connective tissue. areolar connective tissue, adipose connective tissue, and dense connective tissue.