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Anal canal 3 covering epithelia present columnar zone-simple columnar epithelium with abundant goblet cells (associated with crypts of leiberkuhn) intermediate zone- stratified squamous non keratinized which is followed by epidermis has internal hemorrhoidal plexus and internal sphincter muscles of the anus skeletal muscle fibers Skin zone: stratified squamous keratinized has hair follicles and sebaceous glands