Related Experiment Videos
The morphology of ciliogenesis in the developing fetal human respiratory epithelium
G J Moscoso1, M Driver, J Codd
1Department of Morbid Anatomy, King's College Hospital School of Medicine and Dentistry, London.
Insights
Human embryonic respiratory epithelium begins developing cilia around 7 weeks gestation, starting in the upper trachea and spreading downwards. This study details the patterns of ciliation and basal body formation, comparing them to conditions like Immotile Cilia Syndrome.
Area of Science:
- Developmental Biology
- Respiratory Medicine
- Cell Biology
Background:
- Cilia are crucial for respiratory tract function.
- Understanding early respiratory epithelium development is vital for diagnosing congenital disorders.
Purpose of the Study:
- To investigate the onset and pattern of ciliogenesis in human embryonic and fetal respiratory epithelium.
- To describe basal body formation and compare findings with pathological conditions.
Main Methods:
- Segmental imaging of respiratory epithelium from human embryos and fetuses.
- Morphological analysis of ciliation and basal body development.
Main Results:
- Ciliogenesis begins at 7 weeks gestation in the upper trachea, spreading distally.
- Ciliation of the carinal angle occurs at 8 weeks; cartilaginous trachea ciliation starts after 12 weeks.
- Three patterns of basal body formation were identified and described.
Conclusions:
- The study provides a detailed timeline and pattern of respiratory epithelium ciliation during human development.
- Findings align with mammalian respiratory development and offer insights into Immotile Cilia Syndrome.
Abstract:
Segmental imaging studies of the respiratory epithelium from human embryos and fetuses of normal karyotype have demonstrated that ciliogenesis and ciliation of the respiratory epithelium starts at 7 weeks of gestation. Ciliated cell differentiation follows a pre-determined pattern of distribution. It starts exclusively in the upper segment of the membranous trachea and spreads distally. Ciliation of the carinal angle takes place at 8 weeks of gestation. Three patterns of basal body formation were identified. The various morphological features encountered are described and compared with those observed in cases of Immotile Cilia Syndrome and other pathological conditions. Ciliation of the respiratory epithelium in the cartilaginous trachea does not take place until after the 12th week of gestation. The morphological findings identified in our case material are in agreement with those observed in the developing respiratory epithelium of other higher mammals.