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  • Cellules péridermiques  (1)
  • Mesenchymal fusion  (1)
  • Morphogenic necrosis  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Mesenchymal fusion of the palatal processes and of heterotypic explants (1977)
    Springer
    Development genes and evolution 181 (1977), S. 95-102 
    Details
    ISSN: 1432-041X
    Keywords: Medial palatal epithelium ; Mesenchymal fusion ; Epithelial wall ; Labial wall ; Transitional zone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two palatal sheleves were cultured for 3 to 6 h, and palatal shelves and half lips were associated and cultured for 24, 48 or 72 h on an agar culture medium. In all cases an epithelial wall was observed between the two mesenchymes. In homotypical palatal shelf cultures, the medial palatal wall disappears and mesenchymal fusion occurs. The epithelial barrier in palate-lip associations is constituted at first by palatal and labial cells, then purely labial, the medial palatal epithelium undergoing destruction. This labial wall pushed away by the actively growing mesenchyme finally disappears so that the palatal and labial mesenchymes are continuous. This phenomenon is completely different from the mesenchymal fusion and has not the same characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848433
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Changements de l'epithélium médian des bourgeons palatins de souris au stade de préfusion (1977)
    Springer
    Development genes and evolution 181 (1977), S. 357-365 
    Details
    ISSN: 1432-041X
    Keywords: Surfaces de fusion ; Epithelium median ; Cellules péridermiques ; Microvillosités
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Avant d'entrer en contact, les surfaces de fusion des processus palatins subissent des modifications. Certaines cellules épithéliales superficielles deviennent turgescentes, alors que d'autres conservent un aspect dense et aplati, elles se lysent et éclatent. Des noyaux semblables à ceux des assises profondes se retrouvent en surface, paraissant migrer vers le bourgeon antagoniste. Des projections filamenteuses apparaissent, quelques unes établissant un contact avec l'épithélium opposé, d'autres restant seulement sous forme d'expansion. Ces observations sont concordantes en microscopie photonique et en microscopie électronique à balayage.
    Notes: Summary The fusion surfaces of the palatal processes are modified before coming into contact. Several superficial epithelial cells become hypertrophied, undergo lysis and burst, whereas others remain flattened and densely stained. Nuclei, similar to those localized in deeper layers are found on the surface and seem to migrate towards the opposite process. Filamentous projections appear and some establish a linkage with the opposite epithelium, whereas others expand freely from the surface. Light microscope observations agree with scanning electron microscopy findings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848061
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Scanning electron microscope study of the medio palatal epithelium: Simultaneous modifications characterizing fusion and degenerescence processes (1980)
    Springer
    Development genes and evolution 188 (1980), S. 13-21 
    Details
    ISSN: 1432-041X
    Keywords: Palatal shelf fusion ; Epithelial degeneration ; Morphogenic necrosis ; Mouse embryo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The surfaces of the palatine shelves undergo important modifications at the expected zones of fusion immediately preceeding contact. Epithelial degeneration occurs just before and during midline contact and adhesion. The cells retract, become less closely associated with their neighbours and finally their boundaries disapear. Their surface become wrinkled whilst at the same time, blebs and short irregular filaments are observed. These features are interpreted as being morphological characteristics of tissue degeneration. This loss of cohesion may favour the spreading and convergence of the expected zones of fusion towards the midline, and then towards the anterior and posterior extremities. On the contrary, during the process of joining certain portions of the surface swell and converge at the expected zone of fusion. In these regions, the area of contact increases firstly in a naso oral direction. Successive layers are made on which large expansions spread (making) to form bridges between the walls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848605
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    Paper (German National Licenses)
    Fulltext
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