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Development of the human temporomandibular joint. Computer-aided 3D-reconstructions
R J Radlanski1, S Lieck, N E Bontschev
1Freie Universität Berlin, University Clinic Benjamin Franklin, Department of Experimental Dentistry, Germany. RADLANSKI@UKBF.FU-BERLIN.DE
European Journal of Oral Sciences
|April 2, 1999
Summary
This study traces human temporomandibular joint development using 3D reconstructions. Key findings detail the early formation of the mandible, temporal bone, and joint cavities during prenatal growth.
Area of Science:
- Developmental biology
- Anatomy
- Orthodontics
Background:
- The temporomandibular joint (TMJ) is crucial for mastication and speech.
- Understanding TMJ prenatal development is essential for diagnosing and treating congenital abnormalities.
Purpose of the Study:
- To detail the prenatal developmental stages of the human temporomandibular joint.
- To identify the timing of morphological changes in the mandibular and temporal components.
Main Methods:
- Computer-aided 3D reconstructions from serial histological sections.
- Analysis of 12 human embryos and fetuses ranging from 25-250 mm Crown-rump length (CRL).
Main Results:
- Mandibular processes (condylar, coronoid) identified at 25 mm CRL.
- Temporal bone and glenoid fossa developed between 37-65 mm CRL, with fossa contour changing from convex to concave.
- Joint cavities appeared separately (lower at 65 mm CRL, upper at 70 mm CRL) and later fused. Articular disc and muscle attachments observed by 70 mm CRL.
Conclusions:
- The study provides a detailed timeline of human TMJ prenatal development.
- Morphological changes in the glenoid fossa and joint cavities are described.
- Early development of the articular disc and muscle attachments is highlighted.