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Sex differences in prenatal oral-motor function and development
J L Miller1, C Macedonia, B C Sonies
1Department of Health and Human Services/National Institutes of Health, National Institutes of Child Health and Human Development, Clinical Center, Physical Disabilities Branch, Bethesda, Maryland 20892, USA. jmiller@cc.nih.gov
Developmental Medicine and Child Neurology
|May 17, 2006
Summary
Prenatal development shows sex-specific differences in oral and airway motor skills. Females develop complex oral-motor and upper airway functions earlier than males, indicating distinct developmental trajectories.
Area of Science:
- Prenatal development
- Neuroscience
- Pediatric medicine
Background:
- Understanding sex-related differences in prenatal development is crucial for identifying potential developmental variations.
- Early oral and airway motor functions are foundational for feeding, speech, and overall development.
Purpose of the Study:
- To investigate sex-specific differences in the prenatal development of oral, lingual, pharyngeal, and laryngeal motor activities.
- To compare biometric data and motor patterns between male and female fetuses across the second and third trimesters.
Main Methods:
- Sonographic imaging of the oral-upper airway regions in 85 healthy fetuses (43 males, 42 females).
- Analysis of biometric data and motor patterns, comparing second and third trimester development.
- Statistical comparison of general physical growth, specific lingual and pharyngeal structures, and motor activities between sexes.
Main Results:
- No significant differences in general physical growth between males and females (p>0.05).
- Significant differences observed in the development of lingual and pharyngeal structures (p<0.05).
- Significant sex differences in laryngeal, pharyngeal motor activity, and oral-lingual movements (p<0.05), with females showing earlier emergence of complex skills.
Conclusions:
- Prenatal development exhibits sex-specific trajectories in oral-motor and upper airway skills.
- Differential patterns of prenatal motor development may inform sex-specific indices of oral skill maturation.
- These findings highlight the importance of considering sex in the study of early neurodevelopmental patterns.
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