What specifically occurs to the face during week 5 of embryonic development?
The 2 nasal placodes sink inwards to form the nasal pits and rings of surrounding ectoderm rise up to form nasal prominences.
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What specifically occurs to the face during week 7 of embryonic development?
The medial nasal prominences merge midline to form the apex and septum of the nose as well as the philtrum of the lip
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What occurs to the face during the 7th-12th weeks of embryonic development?
The secondary palate arises from the two maxillary prominences. The lateral palatine shelf protrudes medially into the mouth and the shelves fuse together with the nasal septum.
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What does the action of the palatine shelves growing medially and fusing with the nasal septum do?
It separates the nasopharynx from the oropharynx and separates the nasal cavities from each other.
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What are anterior clefts?
Deficits due to the incomplete fusion of the maxillary and medial nasal prominences (Lip and alveolus)
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What does a unilateral anterior cleft cause?
It causes the philtrum to become isolated from the rest of the lip.
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What does a bilateral anterior cleft cause?
It causes the whole intermaxillary segment to hang free from the nasal septum and project forward, resulting in considerable deformity and dental misalignment.
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What are posterior clefts?
Deficits in the development of the lateral palatine shelves and the nasal septum.
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What is meant by the term 'unilateral posterior cleft'?
The failure of one palatine shelf to reach the septum
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What is meant by the term 'bilateral posterior cleft'?
The failure of both shelves to reach the septum
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Other cards in this set
Card 2
Front
What specifically occurs to the face during week 7 of embryonic development?
Back
The medial nasal prominences merge midline to form the apex and septum of the nose as well as the philtrum of the lip
Card 3
Front
What occurs to the face during the 7th-12th weeks of embryonic development?
Back
Card 4
Front
What does the action of the palatine shelves growing medially and fusing with the nasal septum do?
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