HISTOLOGICAL AND HISTOCHEMICAL-INVESTIGAT IONS OF THE SKIN OF THE BOVINE MAMMARY-GLAND WITH SPECIAL REFERENCE TO CHANGES DURING THE PERFUSION IN AN IN-VIVO MODEL

Generally, the skin of the bovine mammary gland is found to be similar to the skin of the integument. In the epidermis, the stratum lucidum is lacking. A prominent stratum corneum can be observed as well as in the haired areas and in areas without hairs as well. Distinct granules of melanin are located mainly in the stratum basale in pigmented skin areas. By means of the alkaline phosphatase, dendritc cells can be se en in the basal parts of the epidermis. In the cerium, collagenous fib res are less thick below the epithelium, whereas coarse bundles are se en deeper in the stratum reticulare. The appearence of multilobal seba ceous glands and apocrine sweat glands is associated with a hair folli cle, which occur loosely distributed as single hairs. A large erector pill muscle is situated on the side of the hair slope. The numerous sw eat glands with wide diameters appeare below the hair papilla, and var y greatly in shape and size. Myoepithelials cells are seen at the peri phery of its secretory portions. The small number of differences in al l areas of the skin examined, are reduced to differences between haire d areas and the base of the teats. The histologic structure of the epi dermis remains unchanged by the perfusion. A partly collagenolysis occ ur in the dermis and subcutis.