palate formation & its developmental anomalies

1. DESCRIBE THE PALATE
FORMATION
& ITS DEVELOPMENTAL
ANOMALIES
Amjad Al-bleahid

2. Introduction
 The palate is the tissue between the oral &
nasal cavities.
 It develops from two parts:
 1-The primary palate.
 2-The secondary palate.
 The primary palate appears earlier than the
secondary palate

3. Primary palate
 The primary palate is also called the median
palatine process or the premaxillary bone
 Develop at the beginning of the 6th Week of
IUL
 It is a wedge shaped tissue occupying the
anterior area of the hard palate anterior to the
incisive fossa
 It carries the 4 maxillary incisors

5. Primary palate
-Primary palate
develops from MNP
or the intermaxillary
segment
-It develops during
the development of
the nasal cavity
towards the oral
cavity

7. Development of the Secondary
Palate
 The secondary palate is that part of the palate
posterior to incisive papilla.
 - It forms the remaining part of the hard palate
and soft palate.

8. Development of Secondary Palate
 1. Palatal shelf formation.
 2. Palatal shelf elevation.
 3. Fusion of primary and secondary palates.
 4. Hard palate and soft palate

9. I. Palatal Shelf Formation
 At the end of the 6th week, 2 lateral palatine
processes develop from the inferio-medial
edges of the maxillary processes
 At first, they grow medially & downward on
either side of the tongue

11. II. Palatal Shelf Elevation
 From 8-9 weeks of IUL, the lateral palatine
shelves slide or roll over the tongue & acquire
a horizontal position (shelf elevation)

13. III. Fusion of the Primary & Secondary
Palates
 The palatine closure begins from the 9th to the
12th Week of IUL
 The fusion occurs by contact of the 2
processes, loss of intervening epithelium &
growth of connective tissue across the midline

15. Developmental Anomalies-Cleft
Palate
 Cleft palate is less common than cleft lip. Clefts of
the palate may be unilateral or bilateral & are
classified into three groups
 Causes
 It may be due to lack of growth
 It may also be due to interference with palatal
shelves elevation
 Failure of fusion between the median & lateral
palatine processes & the nasal septum
 It may be due to initial fusion with interruption of
growth at any point along its course

16. 1. Cleft of Primary Palate
 Clefts anterior to the incisive foramen
 These result from failure of the lateral palatine
processes to
 meet & fuse with the primary palate
 Clefts of the primary palate are usually associated with
missing or malformed teeth adjacent to the clefts such
as lateral incisors & canines

17. 2. Clefts of the Secondary
Palate
 Clefts posterior to the incisive foramen
 They are due to partial or complete failure of
the lateral palatine processes to meet, fuse
with each other & with the nasal septum

20. Thanks for listening..
Note : that cleft palate must be
accompanied by cleft lip While cleft
lip can be alone without cleft
palate or it is not accompanied by
cleft palate