Objective To determine the changes occurring during diCerences in content between groups 1 and 3, 1 and 4, and 2 and 4. The content in group 4 was ipsilateral spermatic cord torsion either in the presence or absence of the ipsilateral testis and epididymis, by significantly less than that in group 3. There were no significant diCerences in nitrite-nitrate contents evaluating noradrenaline and nitrite-nitrate concentrations in the contralateral testes.among any of the groups. Conclusion Spermatic cord torsion for 24 h, either in the Materials and methods Forty male albino rats were allocated randomly to one of four equal groups underpresence or absence of a testis and epididymis, significantly decreased the noradrenaline content in the going: group 1, a sham operation; group 2, ipsilateral spermatic cord torsion; group 3, epididymocontralateral testis. This finding supports the suggestion that the sympathetic system is activated by expoorchidectomy only; and group 4, spermatic cord torsion after epididymo-orchidectomy. The contralateral sure to noradrenaline in the contralateral testis during ipsilateral spermatic cord torsion, with no dependency testes were harvested after 24 h and the noradrenaline and nitrite-nitrate contents determined. The levels in on the presence of a testis and epididymis. As the nitrite-nitrate concentrations were unaCected, nitric each group were compared using the Kruskal-Wallis and Mann-Whitney U-tests.oxide seems to have no role in contralateral testicular deterioration. Results The noradrenaline content of testes from group 2 was significantly lower than in those of Keywords Spermatic cord torsion, contralateral testicular damage, catecholamines, nitric oxide groups 1 and 3, but there were no significant rated within 24 h of ipsilateral spermatic cord torsion,