epithelial tissue what is it
Epithelium is one of the four main tissue types in the body, along with muscle, connective tissue, and nervous tissue. It functions mainly to line surfaces in the body, and lies on top of connective tissue, to which it is anchored by a basement membrane consisting mainly of collagen fibers.ypes of non-keratinized epithelium include tissue that lines the esophagus. Skin is made up of epithelial tissue. Transitional epithelium is found only in the urinary system structures of the renal pelvis, bladder ureter and urethra.
Epithelium (epi- + thele + -ium) is one of the four basic types of animal tissue. The other three types are connective tissue, muscle tissue and nervous tissue.f it is two or more cells thick, it is known as stratified epithelium. However, when taller simple epithelial cells (see columnar, below) are viewed in cross section with several nuclei appearing at different heights, they can be confused with stratified epithelia.