Animals that are continually housed, and the skins of which receive no cleaning, generally present a coat filled with fine scales, composed of epithelium from the epidermis and dried sebaceous matter.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
The lining or covering tissues, both internal and external, are known as epithelium.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
These white patches are succeeded by ulcerated surfaces, which are caused by the shedding of the white patches of epithelium.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler