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Microfissure between the round window niche and posterior canal ampulla
The Annals of Otology, Rhinology, and Laryngology
|January 1, 1977
Summary
A fetal communication near the round window develops into a microfissure in human temporal bones. This anatomical finding is a normal developmental structure, not a pathological condition.
Area of Science:
- Otolaryngology
- Human Anatomy
- Developmental Biology
Background:
- The round window niche and posterior canal ampulla are critical structures in the middle ear.
- Understanding their developmental relationship is key to interpreting anatomical variations.
Purpose of the Study:
- To investigate the developmental origin and prevalence of a microfissure between the round window niche and posterior canal ampulla.
- To determine if this microfissure represents a normal anatomical variation or a pathological finding.
Main Methods:
- Examination of human temporal bones from fetal, child, and adult stages.
- Histological analysis to identify and characterize the microfissure and associated tissues.
Main Results:
- A communication filled with mesenchymal tissue and blood vessels was observed between 10-15 week fetuses.
- This communication evolved into cartilage and later disappeared by birth, reappearing as a microfissure after one year of age.
- The microfissure was present bilaterally in 100% of individuals over six years old.
Conclusions:
- The microfissure originates from a fetal communication between the round window niche and posterior canal ampulla.
- It is a normal developmental and anatomical structure, not indicative of pathology.