FIBRO-ARCHITECTONICS OF HUMAN TEMPOROMANDIBULAR JOINT
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概要
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To observe the fiber architectonics of the human temporomandibular joint, i. e. that of its discus interarticularis as well as of its synovial membrane, the author carried out the following three methods. 1. The joint has been sectioned in toto with tungsten knife, by the use of Reichert-Jung Heavy-duty Mikrotome type K, after embedded in histosec and followed routine procedures. 2. The small part of the joint containing joint-space lining tissues are embedded in styrene and sectioned with glass knife. 3. The synovial membrane was stripped off under binocular microscope (10-30×) after bathed in staining fluids (membrane-like film preparation). The fiber-architectures are described of the synovial membrane and the disc. The synovial membrane consists typically of synovial cells (s in the figures), lamina propria (ps) and subsynovial tissue (ts). In the central part of the disc, where the fibro-cartilage cells are observed, the fibers of ps-layer and ts-layer and of the disc unit. In the peripheral region and the transitional parts to articular cartilage (attachment-Rees, 1954) the three layers are distinguishable. In film preparation can be obtained views unexpected from the section preparation ; fig. 16 shows the medial peripheral part in section, fig. 17 shows the synovial membrane being observed from the synovial surface in film preparation. The collagen fibers, of the ps-layer, forming bundles, run in concentric circle to the central part of the disc, but the collagen fibers of the ts-layer run radially. Elastic fibers, running in concentric circle to the same part, form three-dimentional net-work.<BR>The fiber-running directions give a hint for the movement of the joint and its disc.
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