Rat and sperm granuloma

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By utilizing the rabbit model, previous studies have found good evidence indicating that vasectomy-induced spermatogenic damage is pressure-mediated: the damage occurs when the occluded reproductive tract is unable to accommodate additional spermatozoa produced by the testis. More studies with the more commonly used rat model have shown, however, controversial results on whether and why the damage occurs. In this study, 12 mature male Sprague-Dawley rats were subjected to unilateral vasectomy: double ligation without severing of the vas deferens exposed via a small inguinal incision; 37 days after the operation, the testes, epididymides, vasa deferentia juxta-epididymal segments , and sperm granulomas at the vasectomy site were removed to obtain methacrylate resin-embedded sections and morphometric studies carried out with light microscopy. It seems therefore that the spermatogenic damage induced by vasectomy in rats is pressure-mediated as well, and that variation in the damage depends mainly on the postoperative development of the sperm granuloma.
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Observations on multiple sperm granulomas in the rat epididymis following vasectomy.

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Observations on multiple sperm granulomas in the rat epididymis following vasectomy.

E-mail address: S. McDonald bio. Use the link below to share a full-text version of this article with your friends and colleagues. Learn more. Despite the presence of the multiple granulomas, only two rats showed continuity of the epididymal duct with the central sperm mass of a granuloma. A further three specimens showed breaks in the epididymal epithelium at sites of local distension in the epididymal tail. Granulomas in the epididymal body seem to receive spermatozoa only transiently.
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Epididymis - Sperm Granuloma

Federal government websites often end in. The site is secure. Testis and epididymis. Academic Press, San Diego, Proliferative and nonproliferative lesions of the rat and mouse male reproductive system.
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Seven epididymides of long-term vasectomized rats showing multiple sperm granulomas were studied in serial histological sections. Despite the presence of the multiple granulomas, only two rats showed continuity of the epididymal duct with the central sperm mass of a granuloma. A further three specimens showed breaks in the epididymal epithelium at sites of local distension in the epididymal tail. Granulomas in the epididymal body seem to receive spermatozoa only transiently. The spermatozoa at the center of granulomas in continuity with the epididymal duct showed evenly distributed sperm heads.
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