Prolonged epididymal sperm storage in vespertilionid and rhinolophid bats, provides an interesting experimental model for the study of spermatozoa epididymal maturation. We examined the presence of the cytoplasmic droplet, and the sequential induction of capacitation and the acrosome reaction in spermatozoa obtained from different epididymal regions (caput, corpus, cauda) throughout the annual reproductive cycle of Corynorhinus mexicanus (C. mexicanus). This is a vespertilionid bat that stores spermatozoa in the epididymis for several months after testes regression. The number of sperm recovered from the different epididymal regions indicate that epididymal transit in C. mexicanus is rapid. The persistence of a high percentage of sperm cells with cytoplasmic droplet in cauda epididymis was observed in addition to a low index of capacitation and acrosome reaction in sperm cells obtained from the corpus epididymis. There was a significant increase in the percentage of capacitated and acrosome reacted spermatozoa during the storage of sperm cells in the cauda epididymis and the percentage of capacitated spermatozoa was consistently, and significantly, higher (p < 0.05) in cauda compared to the corpus epididymis at all studied dates. The process of epididymal maturation in C. mexicanus is completed in the caudal region of this organ encompassing a significant period. Our results also indicate that in C. mexicanus, and in other vespertilionid and rhinolophid bats that show the same temporal asynchrony in the function of male reproductive organs, the final phases of epididymal maturation and storage are, apparently, independent of testicular function.

中文翻译：

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墨西哥大耳蝠（Corynorhinus mexicanus）的精子附睾成熟。

长期附睾精子在vespertilionid和rhinolophid蝙蝠中的存储，为研究精子附睾成熟提供了有趣的实验模型。我们检查了在整个Corynorhinus mexicanus（C. mexicanus）的年度繁殖周期中，从不同附睾区域（caput，corpus，cauda）获得的精子中细胞质液滴的存在，依次诱导的获能和顶体反应。这是一种睾丸小蝙蝠，在睾丸消退后的几个月内将精子储存在附睾中。从不同附睾区域回收的精子数量表明，墨西哥念珠菌的附睾转运很快。除了从附睾体获得的精子细胞中的获能和顶体反应指数低外，还观察到附睾中高比例的精子细胞带有细胞质液滴。在附睾中储存精子的过程中，被精子和顶体反应的精子的百分比显着增加，并且在精子中，被精子的被精子的百分比始终如一，并且显着地高于在附睾处的附睾（p <0.05）。所有研究的日期。墨西哥梭菌的附睾成熟过程在该器官的尾部区域完成，包括一个重要时期。我们的结果还表明，在墨西哥念珠菌中，