It is the extracellular matrix that determines the physiological and physicochemical properties of the connective tissue, e.g., the difference between bone, cornea, and blood. The connective tissue literally holds our bodies together. The main cell types in connective tissue proper include fibroblasts, macrophages, mast cells, plasma cells, fat cells and blood leukocytes. Epithelia line all of the cavities and free surfaces of the body. The cells are tightly bound together to form barriers to water, solutes and cells, thus separating one body compartment from another.
Epithelia are avascular.
Please notice the relationship of the connective tissue to the epithelia in the slides for this lab. In the ovary you will find three different types of epithelium. The surface of the ovary is covered with simple cuboidal epithelium. The cells surrounding the oocyte are stratified cuboidal in nature. Zoom out twice and then click link 2.