Results: Serum level of testosterone was decreased in acutely or chronically immobilized rats compared with control animals (P<0.001). In histological study, semeniferous tubules were significantly deformed and cellular concentration was reduced in immobilized rats compared with control animals (P<0.05). The number of spermatocytes, spermatids or sperms was also decreased in immobilized rats (P<0.001) and this pathologic change was more prominent in acutely than chronically immobilized rats. Conclusion: This report underlines the importance of studying the archive material in order to thoroughly comprehend a single museum object. This handling of matters will help to turn anatomical collections into a unique teaching tool for modern medical practice and a noteworthy documentation of scientific, artistic and historical value. Objective: Extramedullary plasmocytoma is an uncommon plasma cell tumor localized preferentially in the upper aerodigestive tract, with no evidence of underlying multiple myeloma. It accounts for less than 1 % of head and neck tumours.