dezvoltarea cefalica (1)
TRANSCRIPT
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DEZVOLTAREA FETEI
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DEZVOLTAREA PALATULUI
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Development of Palate
The palate develops from two stages:
Primary palate
Secondary palate
Palatogenesis begins at the end of the fifth week andis completed at twelfth week (5------12 )
The critical period of the palate development is from
the endof the sixthweek until the beginningof ninth
week (6 ------ 9) 12Prof. Makarem
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Primary Palate
Early in the sixth week theprimary palate or median
palatine process begins to develop from theintermaxillary segment of the maxilla
Initially this segment is formed by merging of the
medial nasal prominences
The primary palate forms the premaxillary part ofthe maxilla
It represents only a small part of the adult hardpalate
(2 Medial nasal prominences >>>>intermaxillarysegment .>>>>>>>>>-primary palate).
13Prof. Makarem
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Initially the lateral
palatine processes or
palatalshelvesproject
inferomedially on
each side of the
developing tongue
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17Prof. Makarem
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Palatine processes alsofuse with the nasalseptum and the posteriorpart of the primary palate
The nasal septumdevelops as a downgrowthfrom internal parts of the
merged medial nasalprominences
The fusion between the
nasal septum and thepalatine processes beginsanteriorly during the ninthweek and is completedposteriorly by the twelfthweek 19Prof. Makarem
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20Prof. Makarem
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Palatal shelves move medially andfuse with the nasal septum.
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Bone gradually develops in theprimary palate, forming thepremaxillary part of the maxilla,
which lodges the incisor teeth
Concurrently bone extends fromthe maxillae and palatine bones
into the lateral palatineprocesses to form the hardpalate
The posterior part of theseprocesses do not ossified.
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They extend posteriorly
beyond the nasal septum
and fuse to form the softpalate.
Its soft conical projection is
called uvula
The median palatine raphe
indicates the line of fusionof the lateral palatine
processes
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25Prof. Makarem
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Prof. Makarem 26
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Prof. Makarem 27
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DEZVOLTAREA DINTILOR
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Dezvoltarea dinilor
Lamina dentalis : ngroareaectodermului ce acopermaxilaimandibula n S 7; prolifereaz n mezenchimul subiacent iformeaz 10 muguri ai dentiiei deciduale, organeleadamantoblaste(ameloblaste)
Mugurele smaluluinvagineaz sub form de cup (statuscappalis), apoi de clopot (status campanalis);
se difereniaz n strat extern (epithelium enameleum externum) iunul intern (epithelium enameleum internum)
Mezenchimul condensat n interiorul clopotului formeaz
papilla dentis, celulele periferice se difereniaz nodontoblaste.
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Dezvoltarea dinilor
Histodiferenierean ameloblasteiodontoblasteeste indusde interaciuneaepitelio-mezenchimatoas
Ameloblastele stratului intern formeaz coroana dintelui,stratul extern formeaz cuticula dintelui (membrana
Nasmyth), care regreseazdupnatere. Mezenchimul din jurul mugurelui dentar formeaz sacculus
dentis i se difereniaz n lamina cementoblastica (secretcimentul), lamina periodontoblastica (ligamenteleperiodontale), lamina osteoblastica (osul alveolar).
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