【摘要】 本文用透射电镜首次观察了斯氏并殖吸虫的初级精母细胞第一次减数分裂,其中包括前期I的细线期、偶线期、粗线期和终变期,中期I、后期I和间期的超微结构特点。该虫雄性生殖细胞中染色体的遗传现象,类似于哺乳动物的减数分裂过程,同属终端减数分裂。另方面,雄性生殖细胞在分裂过程中,胞质的分裂不够完全,两个子细胞之间仍然由原生质构成的细胞间桥连接。更多还原

【Abstract】 The present paper is the first report on the ulfrastructure of the meiotic division of primary spermatocytes of Paragonimus skrjabini using transmission electron microscopy. Fresh testes specimens were isolated from the adult worm of P. s\rjabini under the dissection microscope before being fixed with 2.5% glutaraldehyde. The prophase of the first meiotic division of primary spermatocytes consisted of leptotene, zygotene, pachytene and diakinesis stages. Observation were made on the prophase, metaphase 1, anaphase 1 and interkinesis. The meiotic division in the germ cells of the male worm was similar to that in mammals and it was of a terminal type. During the division of germ cells of male P. skrjabini, the primary Spermatocytes formed large clusters. Our observation showed that cytokinesis was incomplete. Germ cells with synchronous development were linked by intercellular bridges. These bridges persisted until the last moment when individual spermatozoa were released from the clusters.更多还原