[Ultrastructural analysis of the supralingual growth of the palatine processes in Oryctolagus cuniculus (Burgundy brown rabbit)].
During the period between 17 days and 17 days 6 hours, the palatal processes position themselves above the dorsal aspect of the tongue. Between 17 days 6 hours and 17 days 12 hours, they continue their growth in a horizontal plane. The degeneration of the epithelial cells of the future contact zone has already started and is materialized by the presence of an atypical nucleolus. In the zone where the median extremities of the palatal processes are near each other, the basal lamina is discontinuous. The restructuring of the underlying mesenchyme is characterized by a concentration of cells along the partially regressed basal lamina, a regression of the adjacent collagenous fibres, and by the appearance of numerous clasmatose vesicles. The microvilli situated particularly in the free extremities of the palatal processes can be interpreted as epithelial adhesive factors and as a means of anchorage; this would intervene later when the palatal processes come into contact. In addition, the adhesive phenomenona could depend on the presence of a glycoproteic surface coating corresponding to the cell-coat of the cell periphery.
D000818:Animals; D002448:Cell Adhesion; D004848:Epithelium / Q000648:ultrastructure; D008648:Mesoderm / Q000648:ultrastructure; D008871:Microvilli / Q000648:ultrastructure; D009940:Organoids / Q000648:ultrastructure; D010159:Palate / Q000196:embryology / Q000648:ultrastructure*; D011817:Rabbits; D013997:Time Factors
Analyse ultrastructurale de la croissance supra-linguale des processus palatins chez Oryctolagus cuniculus (fauve de bourgogne).