On the attachment between the lamina propria mucosae and the epithelium in gingiva and hard palate.

Many investigators have reported on the fine structure of the boundary between dermis and epidermis, but their results were different from one another. Herxheimer (1916), working on the normal and abnormal human skin, pointed out that the cytoplasmic processes of the epithelial cell project toward the dermis and they are intimately associated with the translucent basement membrane which exists just beneath the epidermis. Fr iebo es (1920) said that in the intersp4ce between epidermis and dermis there is a " Verfilzungszone " consisting of reticular fibre and the cytoplasmic processes of the basal cells of the epidermis project into this zone. Homma (1922), Kogoi (1923), Hoepke (1925) and others, investigating on the boundary between epidermis and dermis, reported that there are intimate relations between the reticular fibre of dermis and the cytoplasmic processes of the basal epidermal cells. Szo dor ay (1931) stated that the junction between basal layer of the epidermis and dermis was just like " two brushes fitted together along their bristle surfaces ". However, Dick (1947) pointed out that it had not been proved whether processes of the epitherial cells fit into an open reticular mesh-work or whether the basal cytoplasm of the epitherial cells is penetrated by the free ends of reticulum fibrils. Od land (1950) studied the relationship between the basal cells of the epidermis and the underlying dermis to solve the problem which Dick presented. (MI and says that the processes of the cytoplasm of the basal epitherial cells fit into the meshwork of the reticular fibres and that the visual effect of the endings of the reticular fibres was the seeming appearance of the bulbous ending, and says that what actually takes place is that when the reticular strand is cut in histological sections at certain angles by