Development of Lip and Palate 😍

Development of Lip and Palate

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Forms from
Non-fusion
Upper Lip
Maxillary process &
Medial Nasal Process/philtrum
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Lower Lip
Mandibular process
Midline cleft lower lip
Midline cleft lower lip
Midline cleft lower lip
notion image
  • Midline cleft upper lip:
    • Non-fusion of MNP
        • Midline cleft upper lip
        Midline cleft upper lip
  • U/L cleft upper lip:
    • Non-fusion of MNP + maxillary process.
        • U/L cleft upper lip
        U/L cleft upper lip
  • B/L cleft upper lip:
    • Non-fusion of both MNP + maxillary process
    • Leads to exposed nasolacrimal duct.
    • Results in harelip.
        • B/L cleft upper lip
        B/L cleft upper lip
  • Oblique facial cleft:
    • Occurs when maxillary process cannot reach the lateral nasal process.
      • notion image

Palate Development

  • MNP (FNP) forms
    • Pre-maxilla
    • Incisive fossa of the palate → gives passage to greater palatine artery.
  • Maxillary process forms
    • Palatine process → forms the remaining part of the palate.
  • Muscles of palate:
    • Derived from 4th pharyngeal arch
    • Exception: Tensor veli palatini (TVP) → from 1st arch.