日本沼虾雄性生殖系统的研究─—雄性生殖系统的结构及发育

摘要:

日本沼虾的雄性生殖系统由精巢、输精管、端壶腹和雄性生殖孔组成。精巢外被一层结统组织膜，内为许多生植小管，小管壁包括生精上皮和管壁上皮，生精上皮不断向管腔内增殖，形成不同发育阶段的雄性生殖细胞，输精管分为前输精管（细段）、中输精管（螺旋段）和后输精管（直段），其管壁均由高柱状上皮和矮柱状上皮构成，具有分泌功能；端壶胞壁肌肉层厚，其它结构与输精管壁相仿。精巢的发育季节性明显。

Abstract:

The structure and development of male reproductive system in the freshwater prawn, Macrobrchium nipponense, was studied with paraffin-section method from September 1992 to Auguest 1993, The male reproductive system consists of paired testes, vas deferens, terminae ampulla and male gonopore. The testes contain great number of seminiferous tubules. Each tubule is made up of germinative epithelium and tubule liner.The germinative epithelium produces various spermatogenis cell areas. The vas deferens can be divided morphologically into three regions: the anterior, the middle belonged to high convolution, and the posterior. The vas deferens is composed of columnar epithelium surrounded by striated muscle. Two types of cells,high columnar cells and low columnar cells can be distinguished in the epithelium of the vas deferens which can secrete spermatophore matrixes. The terminal ampulla is highly muscularized. The development of the testes has seasonal periodicity.