管角螺生殖系统解剖学及组织学观察

Anatomy and histology observation on the reproductive system of Hemifusus tuba

解剖并观察了管角螺的生殖系统,采用组织切片技术,对其生殖腺发育及生殖细胞发生过程进行了研究。结果表明,管角螺为雌雄异体,雄性生殖系统主要由精巢、贮精囊、前列腺、输精管和阴茎构成,其中,精巢由生精小管和输精小管组成;根据生精小管内生殖细胞分布和间质细胞数量,精巢发育分为增殖期、生长期(精母细胞分裂期)、成熟与排放期、退化期等4个时期,根据细胞大小、形态及分布特征,精细胞的发生经历了精原细胞、初级精母细胞、次级精母细胞、精子细胞和精子4个阶段。卵巢结构为滤泡型,由滤泡壁和滤泡腔组成,内含嗜酸性颗粒。从卵巢内滤泡的大小、结构及滤泡内嗜酸性颗粒的数量,卵巢发育分为增殖期、生长期、成熟期、排放期和休止期;根据卵细胞的大小、形态及卵黄颗粒的含量,卵细胞发生过程分为增殖期、生长期和成熟期。管角螺生殖腺及生殖细胞的发育均不同步,为多次成熟、多次排放方式。

The reproductive system and gonad development and germ cell occur rence of Hemifusus tuba have been studied by using tissue section techniques.Through tissue section observation,the results showed that H.tuba is gonochorism,and the male reproductive system is mainly composed of spermary,seminal vesicle,prostate,deferent duct and the penis.The structure of the spermary is more branches tubular gland,is composed of the seminiferous tubules and ductulus efferens.According to the size,shape and distribution features of the cell,this paper analysed the form of spermatogenesis which experienced a five-stage process,from spermatogonia,primary spermatocytes,secondary spermatocytes,sperm cells to sperms.According to the topography of the genital cells in the seminiferous tubules and the quantity of the intestitial cell,the development will be divided into the testes of degradtion period,developing period（spermatocytes separatist period）,maturation and mature period,degradtion period,in all four periods.The structure type of the ovary was follicular and it consists of follicle and genital ducts,was full of eosinophilic granule.The ovary development can be divided into following five periods：proliferation period,growth period,maturation period,spawning period and resting period.By the germ cells＇ size,shape and the amount of yolk granules inside,the oogenesis H.tuba might be divided into proliferation period,growth period and maturation period.Gonad and germ cell developments of H.tuba are not synchronized,for they were repeatedly sexually mature,repeatedly ranked fine way.