Development of the temporomandibular joint in human fetuses
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概要
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The morphology of the temporomandibular joint (TMJ) in eight human fetuses, which ranged from 19 to 25 weeks of gestation (measuring 158mm to 213mm in crown-rump length), were investigated with light microscopy and scanning electron microscopy (SEM). One joint obtained from each fetus was sectioned in the sagittal, coronal, or horizontal plane. Each section was 5 microns thick and every fifth section was stained with hematoxylin and eosin or Elastica van Gieson stain, and neighboring sections of the same specimen were observed with SEM. It was the purpose of this work to investigate whether or not there was an influence on the development of the TMJ by the movement of the mandible in fetal stages. In this series, calcification in the area of attachment of the lateral pterygoid muscle to the condyle was earlier than that in other condylar regions. In the lateral and medial area of the lower joint cavity of the temporomandibular joint, the cavity space seemed to develop from tearing between the disk and condyle. In the SEM findings, the upper collagen fibers of the disk were dense and there were few of fibro blasts while the lower fibers of the disk were very sparse, and there were more cellular elements. It is suggested that functional adaptability is earlier in the upper region of the disk than the lower one. The surface of the condylar head had crinkles on its top area. In addition we observed a condensation of the nucleus in some parts of condylar proliferating portion in the hematoxylin and eosin stained findings. These findings suggest that there is a possibility of "apoptosis" in development of the temporomandibular joint.
- 一般社団法人 日本顎関節学会の論文
一般社団法人 日本顎関節学会 | 論文
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