Formation of the palate


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Formation of the palate

  1. 1. FORMATION OF THE PALATE By: Dr.Carmina Granado
  2. 2. Formation of the Palate <ul><li>Initially, during the 6 th week of development, there is a common oronasal cavity bounded anteriorly by the primary palate and occupied mainly by the developing tongue </li></ul>
  3. 3. palate <ul><li>The tissue that separates the oral & nasal cavities. </li></ul><ul><li>This palate, although thin, is separated by bone, which provides rigidity </li></ul><ul><li>Develops from an anterior wedge-shaped medial part & two lateral palatine processes. </li></ul>
  4. 4. <ul><li>The medial part is also known as the primary palate because it develops first and is a floor to the nasal pits. </li></ul><ul><li>Lateral palatine process develop from the maxillary tissues laterally & grow to midline. </li></ul>
  5. 5. <ul><li>It has been said that the primary palate is formed by the merging of the two median nasal processes </li></ul>
  6. 6. <ul><li>Between the 7 th and 8 th weeks of development, formation of the secondary palate occurs </li></ul>
  7. 7. <ul><li>Formation of the palate involves the fusion of two processes: the right and left maxillary processes and the medial nasal process </li></ul>
  8. 8. <ul><li>The median nasal process grows downward and forward to form the nasal septum </li></ul>
  9. 9. <ul><li>The growth into the stomatodeum from the inside of the maxillary processes is called the right and left lateral palatine processes , which at first grows downward to the elevated tongue </li></ul>
  10. 10. <ul><li>As a result of the enlargement of the mandible and a change in the degree of flexion of the fetus head, the tongue drops to the floor of the stomodeum </li></ul>
  11. 11. <ul><li>When the tongue is removed from the path of the growing lateral palatine processes , the processes are straightened to a horizontal position </li></ul>
  12. 12. <ul><li>Then the lateral palatine processes grows medially at the midline and fuse with each other and with the lower border of the nasal septum to give rise to the hard and soft palate </li></ul>
  13. 13. <ul><li>At their anterior borders, they meet and fuse with the posterior border of the premaxillary growth (primary palate) </li></ul><ul><li>The structure thus formed is at once the roof of the oral cavity and the floor of the nasal cavity </li></ul>
  14. 14. Clinical Considerations <ul><li>Cleft palate – is the result of the non-fusion of the 2 palatine processes and the inferior border of the nasal septum </li></ul><ul><li>Uranoschisis – cleft hard palate </li></ul>
  15. 15. Staphyloschisis – cleft soft palate
  16. 16. <ul><li>Microstomia – abnormally small mouth due to the excessive merging of the mandibular and maxillary processes </li></ul><ul><li>Macrostomia – big mouth resulting from incomplete union of the maxillary and mandibular processes. May also be called cleft of the cheek </li></ul>
  17. 17. <ul><li>Cleft jaw – non fusion of the globular processes with the maxillary processes (for upper) or non-union of the 2 mandibular processes forming the so called true median cleft </li></ul>
  18. 24. <ul><li>GOOD DAY! </li></ul>