2. Classification 1)Covering epithelium: the epithelium which cover body surface or line the inner surface of body cavities, tubes and sac 2)Glandular epithelium: the epithelium which main function is secretion 3) Sensory epithelium: the epithelium which has special sensory function2.Classification 1) Covering epithelium: the epithelium which cover body surface or line the inner surface of body cavities, tubes and sac. 2) Glandular epithelium: the epithelium which main function is secretion. 3) Sensory epithelium: the epithelium which has special sensory function