Abstract
Cryptorchidism is associated with male infertility due to germ cell loss in response to elevated temperature. However, there is a great deal of contradictory information prevalent on the status of germ cells and their process of removal in the cryptorchid testis. In the present study, we investigate the cell removal from cryptorchid rat testis by the methods of morphology and stereology. The testis weight is reduced according to previous reports after surgical induction of cryptorchidism. Interestingly, the epididymal weight is significantly increased in 7 days after surgery, and the caput epididymis tubules show filling with countless round germ cells. We found that the elongating spermatids (steps 10–13), newborn spermatids (step 1) and the dividing spermatocytes are the most susceptible cells to elevated temperature, and are the first disappeared cells from the seminiferous tubules after surgery. Germ cell removal followed the order, starting first with elongating spermatids and newborn spermatids, followed by round spermatids and elongated spermatids and later extending to spermatocytes.
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