The experiments reported here demonstrate that the isolated testicular capsules of both the adult rat and rabbit contain smooth muscle and are capable of undergoing marked contraction following exposure to a number of autonomic agents. In addition, the isolated testicular capsule of the rabbit displayed rhythmic spontaneous contractions. In contrast, no spontaneous activity and only negligible contractions to a few autonomic agents were observed from the isolated mass of testicular parenchymal tissue. It would therefore appear that the testicular capsule plays the major rôle in providing a propelling force for transporting large numbers of non-motile spermatozoa out of the testis and into the epididymis for acquisition of motility.
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