Abstract
The ultrastructure of the fibrous articular tissue of the rat mandibular condyle at 20 and 80 days of age was investigated. The articular tissue was composed of collagen fibres, immature elastic fibres and fibroblasts. At 20 days of age the articular surface was formed by a smooth electron-dense layer about 0.15 μm thick. Some fibroblast cell processes extended through the surface layer into the lower joint space. At 80 days of age the articular surface was formed by a distinct, even layer of fibrillar material up to 1.3 μm thick. There were no fibroblast cells close to the articular surface. Numerous membranebound vesicles of varying electron density were present in the fibrous tissue. The collagen fibres, elastic fibres and articular surface layers probably fulfil functional requirements which are specifically related to their physical properties.
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