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Development of the occipitopetrosal junctions: A histological study using human fetuses
Ai Hirano-Kawamoto1, Yohei Honkura1, Chun-Ai Li2
1Department of Otolaryngology-Head and Neck Surgery, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan.
Anatomical Record (Hoboken, N.J. : 2007)
|May 14, 2025
Summary
This study details the histological development of fetal temporal bone junctions with the occipital bone. Key findings reveal evolving cartilage and ossification patterns, suggesting potential postnatal union for some cranial bone connections.
Area of Science:
- Anatomy
- Developmental Biology
- Histology
Background:
- The temporal bone petrosa connects to the occipital bone at medial and lateral junctions.
- Understanding these cranial bone development processes is crucial for anatomical and clinical insights.
Purpose of the Study:
- To describe histological and topographical anatomical changes during the ossified union of the temporal bone petrosa and occipital bone in human fetuses.
- To analyze the developmental progression of the medial and lateral junctions from early to late fetal stages.
Main Methods:
- Histological analysis of 45 human fetal specimens (7-39 weeks gestational age).
- Examination of the temporal bone petrosa and occipital bone junctions to observe tissue morphology and spatial relationships.
Main Results:
- Early fetal junctions showed dense, mesh-like fibers that disappeared by 12 weeks gestational age, with continuous cartilage.
- By 25 weeks gestational age, the medial junction showed varied cartilage or woven bone, while the lateral junction featured a cartilage mass between ossification centers.
- Advancing ossification at the lateral junction influenced surrounding bone and mastoid air cell development.
Conclusions:
- The development of the medial and lateral junctions of the temporal bone petrosa and occipital bone exhibits distinct histological and topographical changes throughout fetal development.
- The bony union of these cranial junctions may occur postnatally, particularly for the medial junction, influenced by midline growth dynamics.
