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The development of the eyelids. Part I. External features
Journal of Anatomy
|January 1, 1980
Summary
Human eyelid development progresses through distinct embryonic stages, beginning with the lens placode formation and culminating in complete eyelid closure. This detailed timeline maps key events in embryonic eye development.
Area of Science:
- Developmental Biology
- Embryology
- Ophthalmology
Background:
- Eyelid formation is a critical aspect of human embryonic development.
- Understanding the precise sequence of events is essential for identifying developmental abnormalities.
Purpose of the Study:
- To describe the sequential developmental stages of human eyelids in embryonic development.
- To provide a detailed timeline of eyelid formation from early embryonic stages to complete closure.
Main Methods:
- Observation and description of staged human embryos.
- Documentation of morphological changes related to eyelid development.
Main Results:
- The lens placode forms by week four, followed by the development of the lens pit and vesicle.
- Eyelid grooves appear around 37 days, leading to the formation of eyelid folds.
- Eyelid folds develop into complete eyelids, with the palpebral fissure forming and canthi establishing between stages 19-20.
- Complete eyelid closure is observed by Stage 23.
Conclusions:
- Human eyelid development follows a predictable sequence of morphological changes.
- The study provides a detailed staging of eyelid formation crucial for embryological studies.