Development of Face and Palate Question And Answers

Development of face.
Answer:

Development of face:

• Around 4th week of intrauterine life, a prominent bulge develops on the ventral aspect of the embryo.
• Below it there is a depression called stomadeum.
• The mesoderm covering the developing forebrain proliferates and forms a downward projection called frontonasal process.
• The pharyngeal arches are laid down.
• The first branchial arch helps in the development of nasomaxillary complex.

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• It forms lateral border of stomadeum.
• It gives off a bud from its dorsal end called maxillary process.
• Localized thickenings occur above stomadeum called nasal placodes
• These placodes soon sink to form nasal pits.
• At this stage stomadeum is surrounded
  • Above- frontonasal process
  • Sides maxillary process
  • Below mandibular process.
• The resultant nasal pit divides into medial nasal process and lateral nasal process.
• The maxillary process fuses with lateral nasal process and forms nasolacrimal duct.

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Lower lip:

• The mandibular processes of the two sides grow towards each other and fuses in the midline to form lower lip and lower jaw.

Upper lip:

It is formed by the two medial nasal prominences and the two maxillary prominences.

Nose:

• The maxillary process fuses with the medial nasal process, as a result nasal pits are cut off from the stomadeum
• The frontonasal process becomes narrower to form nasal septum.
• The merged medial nasal prominences provide the crest and tip and the lateral nasal prominences form alae.

Tooth formation short notes

Cheek:

• It is formed by the fusion of maxillary and mandibular process.

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