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Premaxillary development in normal and cleft lip and palate human fetuses using three-dimensional computer
M P Mooney1, M I Siegel, K R Kimes
1Department of Anthropology, University of Pittsburgh, PA 15260.
Summary
Fetal cleft lip and palate development shows normal premaxillary growth until 14 weeks. Post-14 weeks, normal fetuses exhibit rapid growth, while cleft cases show significantly reduced premaxillary length and volume.
Area of Science:
- Craniofacial development
- Fetal morphology
- Cleft lip and palate research
Background:
- Cleft lip and palate (CLP) is a common congenital condition.
- Understanding fetal premaxillary development is crucial for CLP research.
- Previous studies have focused on postnatal outcomes, with less emphasis on prenatal growth dynamics.
Purpose of the Study:
- To investigate and compare prenatal premaxillary development in normal and cleft lip and palate fetuses.
- To quantify differences in premaxillary length and volume during early gestation.
- To elucidate the relationship between early midfacial growth and premaxillary deficiencies in clefts.
Main Methods:
- Cross-sectional study of 20 normal and 9 complete cleft lip and palate fetuses (8-21 weeks gestation).
- Coronal sectioning (20 microns) of H&E stained specimens.
- 3D computer reconstruction for premaxilla visualization and quantification of length and volume.
Main Results:
- Normal fetuses show symmetrical premaxillary development and midfacial morphology by 14 weeks.
- Fetuses with complete unilateral clefts exhibit severe asymmetry and dysmorphogenesis.
- Premaxillary length and volume growth rates significantly decrease in cleft specimens after 14 weeks (p < 0.001).
Conclusions:
- Premaxillary deficiencies in cleft lip and palate patients may stem from early prenatal midfacial growth deficits.
- The findings suggest prenatal growth deficits, not initial tissue deficiencies, are key.
- This research provides insights into the developmental origins of cleft lip and palate morphology.