孔鳐雄性生殖系统解剖学与组织学观察

Anatomical and histological studies of the male Kong skate(Okamejei kenojei)reproductive system

本研究对成年雄性孔鳐(Okamejei kenojei)的生殖系统进行解剖学和组织学观察,结果表明,孔鳐的生殖系统主要由精巢、附睾、输精管、储精囊、间质腺、鳍脚腺和鳍脚组成。其中孔鳐的精巢中的精小囊,按照成熟度依次由中心向小叶外周辐射状排列,其精子发育成熟过程根据精巢支持细胞的位置、精小囊的大小和精小囊中的生精细胞所处的状态可划分为7个时期:精巢支持细胞未迁移期、精巢支持细胞迁移期、精巢支持细胞定植早期、精巢支持细胞定植晚期、精子变形期、精子迁移期、精子聚拢期。变态成熟的精子最终每59~64根精子组成精子束进入附睾。精子束在附睾中经历“游离-聚拢-游离”3个过程后,最终储存在储精囊中。鳍脚是孔鳐的外生殖器,主要有鳍扇、扇盾等结构组成,它与储精囊相连,是将精液输送至体外的器官。

The reproductive system of adult male Kong skate(Okamejei kenojei Müller&Henle 1841)was observed anatomically and histologically.The results showed that the O.kenojei reproductive system was mainly composed of the testis,epididymis,vas deferens,seminal vesicles,leydig gland,clasper gland,alkaline gland,and clasper.The spermatocysts in the O.kenojei testis were arranged radially from the center to the periphery of the testicular lobes according to maturity.Sperm development was divided into seven stages,according to the location of the sertoli cells,the size of the spermatocysts,and the state of the spermatogenic cells:nonmigration stage of the sertoli cells;migration stage of the sertoli cells;early stage of sertoli cell colonization;late stage of sertoli cell colonization;sperm deformation stage;sperm migration stage,and sperm aggregation stage.Before entering the epididymis,59-64 sperm form a spermatozeugmata,and after the processes of“dissociation-aggregation-dissociation”in the epididymis,the spermatozeugmatas are stored in the seminal vesicles.Additionally,the results show that the claspers,the external genital organ of O.kenojei,are mainly composed of the rhipidion,shield,and other structures,connected to the seminal vesicles.The claspers are important organs for transporting sperm.