Cuboidal epithelium has cube-shaped cells. Pseudostratified appears to be layered but true layers do not exist because each cell touches a basement membrane that joins epithelium to underlying connective tissue. A gland may be a single epithelial cell such as a goblet cell in digestive tract that produces mucus. Tight junctions form an impermeable barrier because adjacent membrane proteins join, producing a zipperlike fastening. Desmosomes are adhesion junctions between two cells, held together by intercellular filaments attached to buttonlike thickenings.
Reticular fibers are very thin and highly branched.
Types of Connective Tissues i. Loose Connective Tissue - binds structures together. Adipose Tissue - type of loose connective tissue. Fibrous Connective Tissue - found in tendons, which bind muscle to bone and ligaments, which connect bone to bone. Cartilage i. Cells lie in chambers called lacunae separated by a flexible matrix.