Three-dimensional and surface structures of rat filiform papillae.
The three-dimensional and surface structures of the simple conical papillae of the rat tongue have been demonstrated with scanning electron microscopy. The papillary projection was organized into the anterior, posterior and central core cell populations, whereas the basal region of the papilla which consisted of circularly arranged cells showed no differentiation into three autonomic cell populations. It is considered that the anterior and posterior cell populations around the central core tend to be mutually attached at the bilateral sides, and that the posterior and core cell contacts are rather close than the anterior one. The anterior papillary cells showed relatively smooth surface with little micropits and without microridges. The reticular microridges on the basal cell surface of the posterior papillary cells appear to later develop the micropits and linear microridges on the tip cell surface. These suggest that the anterior cell surface is more highly keratinized than the posterior one. The microridges or micropits on the outer cell surface and the microprojections on the inner cell surface organizing filiform papilla are considered to be the structures for the purpose of cell adhesion.
D000818:Animals; D004847:Epithelial Cells; D004848:Epithelium / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D051381:Rats / Q000033:anatomy & histology*; D011919:Rats, Inbred Strains; D014059:Tongue / Q000033:anatomy & histology* / Q000166:cytology / Q000648:ultrastructure