The Epidermis

The distribution of enzymes in the skin of the domestic pig

“…This applies particularly to the keratinization processes in the epidermis, the formation of glandular secretions in the tubuli of the apocrine glands and the continual differentiation of the cells of the sebaceous glands. These results correspond largely to those obtained in humans (Montagna & Ellis, 1962;Braun-Falco & Rupee, 1968;Brody, 1968;Strauss & Pochi, 1968;Stiittgen & Schafer, 1974).…”

THE ULTRASTRUCTURE OF THE NORMAL CONJUNCTIVAL EPITHELIUM OF THE GUINEA PIG: IV. The Palpebral and the Perimarginal Zones

“…Certain parts of the epithelium of the perimarginal zone resemble other stratified, squamous, nonkeratinized epithelia, such as the buccal and palatal epithelium (Silverman 1971) and the epithelium of the soft palate and of the oesophagus (Rhodin 1974). Towards the lid margin the epithelium began to show certain signs that have been described as preceding keratinization (Brody 1968;Matoltsy 1976) : decomposition of nucleus and cytoplasmic organelles, increased amount of filaments in the outer layers, and absence of microvilli on the epithelial surface.…”

The modified plasma membranes of the transition and horny cells in normal human

“…In other studies of amphibian skin (12) 1 normal human epidermis (5,6,7), rat tongue epithelium (u) and human cervical squamous epithelium (13) it has been dearly demonstrated that the T-and horny cells are bounded by an outer, triple-layered membrane which corresponds to the plasma membrane of the non-cornified cells. The broad zone appears immediately adjacent to the intracytoplasmic face of the inner leaflet of the triple-layered membrane.…”

“…In normal human epidermis it has been shown that the broad zone is delimited from the cytoplasm by a thin, opaque layer (4). On the strength of this observation Brody ( 7) has suggested that the T-and horny cells are bounded by a modified plasma membrane, comprising the outer triple-layercd membrane (here referred to The plasma membrane (o-+) shows in the cells of the stratum intermedium (I) an asym metric, triple-layered pattern. Close to the plasma membrane of the stratum-intermcdium cells facing the horny cells (C) differcnt inter cellular components ( ➔) occur which, how-as the "plasma membrane proper") and the inner broad zone, including the thin, inner opaque layer which delimits the broad zone from the cytoplasm.…”

“…Close to the plasma membrane of the stratum-intermcdium cells facing the horny cells (C) differcnt inter cellular components ( ➔) occur which, how-as the "plasma membrane proper") and the inner broad zone, including the thin, inner opaque layer which delimits the broad zone from the cytoplasm. Rupec (22) and Brody ( 6,7) have demonstrated that the plaques of the regular desmosomes in the non cornified epidermis have a layered struc ture. The inner opaque layer of the plaques can sometimes be recognized outside the regular desmosomes ( 6).…”