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S a k at a (1954) reported on the attachment between the epithelium and lamina propria of the hard palate and the gingiva in man, monkey and cat. T a k a m u r a and S a k a t a (1955) studied the problem on the mucous membrane of the hymen and the esophagus. They said that the cytoplasmic processes of the basal cells of the epithelium and the free endings of the reticular fibers fitted together, as if two brushes did so. Also the junction of the epidermis and dermis, which shows an analogous structure with the mucous mem.brane , has been studied by many investigators. Fr i e b o es (1920), H o m m a (1922) and K o g o i (1923) and others noticed the intimate relationship between the reticular fibers and the cytoplasmic processes of the basal cells of the epithelium. Dick (1947) pointed out, that it is unknown whether the cytoplasmic processes protruded into the network of the reticular fibers or the free endings of the reticular fibers protruded into the basal cytoplasm of the basal cells. Odl and (1950) said, that the cytoplasmic processes of the basal cells got into the network formed by reticular fibers, and that the reticular fibers were continuous showing arches, inspite of their appearance in the sections. They look like terminating with blind endings owing to the angle at the sectioning of the block. The results of the studies on the mucous membrane by S a k at a and T a k a m u r a (1955) differ from that of Odlan d. As above mentioned some studies have been made on the structure of the attach-

On the structure of the attachment between the lamina propria mucosae and the epithelium of the gingiva and the hard palate in human embryos