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PALATE
DEVELOPMENT The primarypalate The secondary
palate Palatogenesis atthe end of the 5th
week IU to 12th week
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The primary palate(median palatineprocess)At the end of the 5th week IU.
from the innermostpart of the frontonasaland medial nasal
processes.It forms a wedgeshaped mass of
mesoderm etweenthe ma!illar
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The secondary palate
de"elops etween
the #th and $th weekIU.from the f%sion ofpalatine processes(shel"es) ofma!illary one. These processesare &rst directeddownward on eachside of the ton %e.
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After the #th week ofde"elopment the tong%e
is withdrawn frometween the shel"es.
'o they ele"ate and
f%se with each otherao"e the tong%e andwith the primary palate.
The intrinsic force within
these shel"es thatres%lts in their clos%rehas not yet een
determined
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• palatal shelf
tongue
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tongue
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edial *.P.
+ateral*.P.
a!. P.
and. P.
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• edial n.p.
• +ateral n p
• a!illary p
• Palatin p.
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• edial n.p.
• +ateral n p
• a!illary p
• Primarypalate
• Palatin p.
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,%sion of the palatal processes
egins anteriorly d%ring the -th week IU and ends posteriorly at12th week IU.
The palatine raphe indicates theline of f%sion of the lateralpalatine shel"es.
one grad%ally de"elop in the1ry palate. Then ossi&cation
e!tend from a!illary one and
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,%sion of palatin processes
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• The posterior portion of lateralpalatine processes doesn’t ossify.
They e!tend eyond nasalsept%m / f%sed to form softpalate and %"%la.
• The %nion etween palatalprocesses occ%rred y ,%sion.
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0left lip and Palate
• 0left lip It may e %nilateral orilateral.
• It range from small notch of the lip to
complete di"ision of the lip andal"eolar part of the ma!illa.
Types Unilateral ilateral and medial.
• 0left palate It may e %nilateral orilateral. The cleft may in"ol"e onlythe %"%la soft palate and may e"ene!tend to hard palate.
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0left +ip
edial
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TONGUE
DEVELOPMENT It egins in the th 3IU
4e"elopment of the %cosa. Anterior 267.
Posterior 167.4e"elopment of the %scle.'peciali8ation of the 4orsal
s%rface of the tong%e.
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1st arch 2nd arch 7rd arch
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1st arch 2nd arch 7rd arch
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Anterior 267 9f %cosa
• 4e"eloped :%st ;ostral toforamen 0ec%m from
TU
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Posterior 167 of %cosa
• 4e"eloped :%st ca%dal toforamen 0PU+A and ;>'T;A+ partof ?@P>;A*0?IA+
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Inner"ation of the tong%e
• A'ensoryinner"ations
• 1anterior two thirds
• 2posterior one third
•otor inner"ation
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4e"elopment of the %scle
• %scles 0T + and+ymphatics de"eloped from
ranchial arches mesenchyme.• Tong%e %scles…. yolasts.
• ?yoglossal ner"e.
• Palatoglossal m%scle frompharyngeal ple!%s.
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'peciali8ation of 4orsal '. T
• Taste %ds appear at #th weekIU as a res%lt of Ind%cti"e
interaction etween s%rface
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• ,illiform and ,%ngiform 11week IU.
• 0irc%m"allate 25 IU (ring of
epitheli%m).• %cosa of posterior 167 Pitted
at irth y +ymphaticIn<ration.
Tong%e
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Tong%eAnomalies
1 Aglossia.2 icroglossia.
7 acroglossia.
i&d tong%e.
5 Ankyloglossia.
B lack hairytong%e.
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Thank You
andGood
Luck
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Give In Five lines only a
summary of Developmentof HUMAN FAE !it"#ia$ram t"at illustrate#
your ans!er
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