Qualitative study of young,adult, and aged wistar rats temporomandibular synovial membrane employing light,scanning, and transmission electron microscopy |
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| Authors: | Christiano Cony Duro Adriano Polican Ciena Sonia Regina Yokomizo De Almeida Marta Maria Da Silva Righetti Débora De Freitas Grisolia João Paulo Mardegan Issa Marcelo Cavenaghi Pereira Da Silva Ii‐sei Watanabe |
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| Affiliation: | 1. Department of Morphology and Genetics, Federal University of S?o Paulo, S?o Paulo, Brazil;2. Department of Anatomy, Institute of Biomedical Sciences, University of S?o Paulo, S?o Paulo, Brazil;3. Department of Surgery, Faculty of Veterinary Medicine and Animal Science, University of S?o Paulo, S?o Paulo, Brazil;4. Department of Morphology, Stomathology and Physiology, Faculty of Dentistry of Ribeir?o Preto, University of S?o Paulo, Ribeir?o Preto, Brazil |
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| Abstract: | The aim of this study was to analyze the rat temporomandibular joint (TMJ) synovial membrane at different ages using light, scanning, and transmission electron microscopy. Under light microscopic analysis, the TMJ structures were observed such as condyle, capsule, disk, the synovial membrane collagen type, and cells distribution. In the scanning electron microscopy, the synovial membrane surface exhibited a smooth aspect in young animals and there was an increase with ageing in the number of folds. The transmission electron microscopic analysis showed more synoviocytes in the synovial layer in the young group and still a great number of vesicles and cisterns dilation of rough endoplasmic reticulum in the aged group. In the three groups, a dense layer of collagen fibers in the synovial layer and cytoplasmic extensions were clearly seen. It was possible to conclude that synovial membrane structures in aged group showed alterations contributing to the decrease in joint lubrication and in the sliding between disk and joint surfaces. These characteristic will reflect in biomechanics of chewing, and may cause the TMJ disorders, currently observed in clinical processes. Microsc. Res. Tech. © 2012 Wiley Periodicals, Inc. |
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| Keywords: | temporomandibular joint synovial membrane aging microscopy electron |
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