长吻鮠精巢及精子结构的研究

长吻鮠精巢高度分支呈指状。后1/3紫红色,由上皮细胞组成,既不产生精子,也不贮存精子。精巢的内部结构为叶型,由体细胞和生殖细胞构成,小叶的基本单位是小囊。精子头短而圆,主要为核占据,无顶体,核凹窝十分发达,有中心粒帽;尾极长,具侧鳍,轴丝基部有发达的囊泡状结构和线粒体。

STUDIES ON THE STRUCTURE OF TESTIS AND SPERMATOZOON IN LEIOCASSIS LONGIROSTRIS

This paper describes the structure of testis and spermatozoon in the Chinese freshwater catfish, Leiocassis longirostris. The testes are branched into finger-like structures. The posterior portion of the testis is purple and is composed of simple columnar epithelium. This purple portion does not produce or contain spermatozoa. The testis has a lobular type of organization and consists of somatic and germinal cells. The somatic cells in the testis include fibroblasts, boundary cells, Sertoli ceils and Leydig cells. The lobule is composed of cysts and the germinal and Sertoli cells in the cysts. The Leydig cells are located between the lobules. The germinal cells include spermatogonia, spermatocytes, spermatids and spermatozoa. The gamete consists of a head, a mid-piece and a tail. The head is short, round or oval in shape, containing a nucleus but no acrosome. The nuclear fossa is very developed. The tail is very long, containing lateral fins. The spermatozoa have rich saceiform structure and mitochondria in the base of flagellar.