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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is withdrawn frometween the shel"es.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&ltration.

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