The development of orofacial complex in bats: Implications for orofacial clefting

Area of Science:

• Comparative anatomy
• Developmental biology
• Mammalian evolution

Background:

• Mammalian orofacial morphology is crucial for feeding and communication.
• Bats display diverse orofacial shapes linked to diet and echolocation.
• Bony discontinuities in bat skulls are unique but their development is poorly understood.

Purpose of the Study:

• Investigate the developmental basis of bony discontinuities in the bat orofacial complex.
• Compare chondrocranium and epithelial organ development across three bat species.
• Re-evaluate classifications of midline clefts in bats.

Main Methods:

• Comparative study of chondrocranium and epithelial organs.
• Analysis of three bat species: Cynopterus sphinx, Rhinolophus malayanus, and Vespertilio sinensis.
• Observation of developmental processes leading to orofacial structures.

Main Results:

• Significant differences in orofacial cartilage and epithelial morphogenesis observed among the three bat species.
• In Cynopterus sphinx and Vespertilio sinensis, specific premaxillary regions were filled with cartilage and epithelial structures.
• Cleft morphology in Rhinolophus malayanus and Vespertilio sinensis arose from divergent developmental pathways.

Conclusions:

• Bat orofacial development is more varied than previously assumed.
• Midline clefts in Yangochiroptera bats should be categorized based on morphogenetic patterns, not as a uniform type.
• Understanding bat orofacial development may inform human cleft palate research.