Formation of the palate

1. FORMATION OF THE FORMATION OF THE
PALATEPALATE
By: By:
Dr.Carmina GranadoDr.Carmina Granado

2. Formation of the PalateFormation of the Palate
Initially, during the Initially, during the
66
thth
week week of of
development, there is development, there is
a common oronasal a common oronasal
cavity bounded cavity bounded
anteriorly by the anteriorly by the
primary palate and primary palate and
occupied mainly by occupied mainly by
the developing the developing
tonguetongue

3. palatepalate
The tissue that separates the oral & nasal The tissue that separates the oral & nasal
cavities.cavities.
This palate, although thin, is separated by This palate, although thin, is separated by
bone, which provides rigiditybone, which provides rigidity
Develops from an anterior wedge-shaped Develops from an anterior wedge-shaped
medial part & two lateral palatine processes.medial part & two lateral palatine processes.

4. The medial part is also known as The medial part is also known as the primary the primary
palate palate because it develops first and is a floor because it develops first and is a floor
to the nasal pits.to the nasal pits.

Lateral palatine process Lateral palatine process develop from the develop from the
maxillary tissues laterally & grow to midline.maxillary tissues laterally & grow to midline.

5. It has been said that It has been said that
the primary palate is the primary palate is
formed by the formed by the
merging of the two merging of the two
median nasal median nasal
processesprocesses

6. Between the Between the 77
thth
and and
88
thth
weeks weeks of of
development, development,
formation of the formation of the
secondary palatesecondary palate
occursoccurs

7. Formation of the Formation of the
palate involves the palate involves the
fusion of two fusion of two
processes: processes: the right the right
and left maxillaryand left maxillary
processesprocesses and the and the
medial nasal processmedial nasal process

8. The The median nasal median nasal
processprocess grows grows
downward and downward and
forward to form the forward to form the
nasal septumnasal septum

9. The growth into the The growth into the
stomatodeum from stomatodeum from
the inside of the the inside of the
maxillary processesmaxillary processes
is called the is called the right and right and
left lateral palatine left lateral palatine
processesprocesses, which at , which at
first grows first grows
downward to the downward to the
elevated tongueelevated tongue

10. As a result of the As a result of the
enlargement of the enlargement of the
mandible and a mandible and a
change in the degree change in the degree
of flexion of the of flexion of the
fetus head, the fetus head, the
tongue drops to the tongue drops to the
floor of the floor of the
stomodeumstomodeum

11. When the tongue is When the tongue is
removed from the removed from the
path of the growing path of the growing
lateral palatine lateral palatine
processesprocesses, the , the
processes are processes are
straightened to a straightened to a
horizontal positionhorizontal position

12. Then the Then the lateral lateral
palatine processespalatine processes
grows medially at grows medially at
the midline and fuse the midline and fuse
with each other and with each other and
with the lower with the lower
border of the border of the nasal nasal
septumseptum to give rise to to give rise to
the the hard and soft hard and soft
palatepalate

13. At their anterior At their anterior
borders, they meet and borders, they meet and
fuse with the posterior fuse with the posterior
border of the border of the
premaxillary growth premaxillary growth
(primary palate)(primary palate)
The structure thus The structure thus
formed is at once the formed is at once the
roof of the oral cavity roof of the oral cavity
and the floor of the and the floor of the
nasal cavitynasal cavity

14. Clinical ConsiderationsClinical Considerations
Cleft palateCleft palate – is the – is the
result of the non-result of the non-
fusion of the 2 fusion of the 2
palatine processes palatine processes
and the inferior and the inferior
border of the nasal border of the nasal
septumseptum
UranoschisisUranoschisis – cleft – cleft
hard palatehard palate

15. StaphyloschisisStaphyloschisis – cleft soft palate – cleft soft palate

16. Microstomia Microstomia – –
abnormally small mouth abnormally small mouth
due to the excessive due to the excessive
merging of the merging of the
mandibular and mandibular and
maxillary processesmaxillary processes
MacrostomiaMacrostomia – big – big
mouth resulting from mouth resulting from
incomplete union of the incomplete union of the
maxillary and maxillary and
mandibular processes. mandibular processes.
May also be called cleft May also be called cleft
of the cheekof the cheek

17. Cleft jawCleft jaw – non – non
fusion of the fusion of the
globular processes globular processes
with the maxillary with the maxillary
processes (for upper) processes (for upper)
or non-union of the 2 or non-union of the 2
mandibular mandibular
processes forming processes forming
the so called the so called true true
median cleftmedian cleft

24. GOOD DAY!GOOD DAY!