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Histologic changes in the mouse epididymides were examined by light and electron microscopy 1, 3, 6 and 10 weeks after surgical fixation of the testes and epididymides to the internal abdominal wall at 2 months of age. In the epididymides subjected to the cryptorchid surgery, the principal cells in the segment next to the initial segment became taller, the nuclei were translocated to a higher position, and the widened infranuclear cytoplasm turned pale. The supranuclear cytoplasm showed a decrease in PAS stainability. Electron microscopy revealed that the infranuclear cytoplasm, which is occupied by small vesicular endoplasmic reticulum in the normal cells, was filled with distended rough endoplasmic reticulum. These changes first appeared one week after operation, further developing with time. Similar changes were observed when the epididymis was in the abdominal position with the testis in the scrotal position, or with the efferent duct ligated to block the testicular fluid flow into the epididymis. It is suggested that the epididymal changes recorded in this paper are induced by the elevation of temperature caused by the translocation from the scrotum to the abdomen.

Histologic changes in the mouse epididymis fixed in the abdominal cavity.