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KMID : 0376219930300020155
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Chonnam Medical Journal
1993 Volume.30 No. 2 p.155 ~ p.164
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The Development of the Articular Disk of Human Distal Radioulnar Joint
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Abstract
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The development of the articular disk of the distal radioulnar joint was studied by electron microscopy in human fetuses ranging from 80mm to 260mm crown rump length. The appearance of the primordium of the articular disk was conspicuous as the
mesenchymal cells, preceding that of the joint cavity at 4mm futus.
The mesenchymal cells containing predominantly free ribosomes at 40mm fetus differentiated into fibroblasts with extensive rough endoplasmic reticulum and Golgi complex at 70mm fetus.
At 100mm fetus, the articular disk was composed of densely arranged fibroblasts and general shape was almost similar to that of the adult.
By 100mm fetus, the fibroblasts in central zone of the articular disk presented as oval profiles with a few short cell processes, whereas dorsal and palmar margins presented as elongated cells.
During next 150mm up to 260mm fetus, the central zone of the articular disk was composed of the intercrossed bundles of collagenous fibers and populated by oval fibroblasts.
The palmar and dorsal and dorsal margins of the articular disk were constituted of parallel fascicules of collagenous fibers with blood vessels and elongated fibroblasts.
It is concluded that the articular disk in fetal period is formed from fibrous nature with an abundant quantity of fibroblasts.
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