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DOI: 10.1080/019262301301418856 Overview of Male Reproductive PathologyPeer Global Research and Development, Groton, Connecticut 06334 An understanding of form and function is important for examination of the male reproductive tract. A basic understanding of spermatogenesis and hormonal function in the reproductive tract is essential for the pathologists in this evaluation. Gross and histologic reproductive changes need to be distinguished from normal variation and correlated with the reproductive status of the animal. This is especially important when correlating histologic changes with organ weight and other reproductive parameters, such as seminal analysis data. Sexual maturity of animals and tissue handing can impact interpretation. Sexual immaturity of preclinical safety animals can present challenges for accurate identification of compound-related changes. Likewise, proper handling of unfixed reproductive tissues and appropriate selection of a fi xation protocol are important in avoiding artifacts that may interfere with the microscopic evaluation. The histopathology technician needs to recognize testicular landmarks that allow for correct orientation at trimming so the pathologist can assess not only the morphology of seminiferous tubules but also the outfl ow tract. For the most effective evaluation of the male reproductive tract, the testes and epididymides should be examined concurrently. Although the term ``staging'' is often used inappropriately, the pathologist should review testicular tissues in a ``stage-aware'' manner. This article reviews gross and histologic changes of the male reproductive tract as well as tissue orientation and fixation to assist in accurate interpretation of potential treatment-related changes in male reproduction.
Key Words: Male • testis • epididymis • toxicology • anatomy • histology
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