Morphological characterization of type B synoviocytes in the temporomandibular joint focusing on expression of the muscle specific proteins

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Fibroblast-like type B synoviocytes(type B cells) in the temporomandibular joint(TMJ) are heterogeneous in their morphology and immunoreactivity. This study revealed that some of the type B cells expressed desmin, a muscle-specific intermediate filament, in adult rat TMJ. Immunocytochemical characteristics of the desmin-positive type B cell suggested that this cell does not have myogenic or contractile ability. In addition, their immunoreaction patterns and ultrastructures resembled those of a precursor of a capillary pericyte during angiogenesis.