Photomicrograph showing the layers of thin skin. This H&E-stained specimen from human skin shows the two chief layers of the skin, the epidermis (Epi) and dermis (Derm). The epidermis forms the surface; it consists of stratified squamous epithelium that is keratinized. The dermis consists of two layers: the papillary layer, which is the most superficial layer and is adjacent to the epidermis, and the more deeply positioned reticular layer. The boundary between these two layers is not conspicuous; the papillary layer is, however, more cellular than the reticular layer. In addition, the collagen fibers of the reticular layer are thick (clearly visible in the lower part of the figure); those of the papillary layer are thin. x45.
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