http://www.kumc.edu/instruction/medicine/anatomy/histoweb/index.htm

It presents images and information related to the histology of the cell structure, epithelia, glands, nervous and muscular system, connective tissue, cartilage, bones, vascular and lymphoid systems, blood and bone marrow, skin, respiratory and gastrointestinal systems, eye and ear, endocrine and urinary systems, female and male reproductive systems, and basic histopathology.