›› 1998, Vol. 16 ›› Issue (4): 269-273.

• 论著 • Previous Articles     Next Articles

ULTRASTRUCTURAL OBSERVATION ON THE TRANSFORMATION OF THE SPERMATOZOON IN SPERMATOGENESIS OF TAENIID CESTODES

Tian Xifengi 1; Yuan Lijie 1; Huo Xiaoqing 1; Han Xiuling 1 ; Li Yihong 2; Xu Min 3; Lu Minjie 3; Dai Jianjun 4; Dong Lu 5   

  1. 1 Department of Parasitology; North China Coal Medical College; Tangshan 063000 2 Department of Parasitology; Harbi 150086;3 Laboratory of Electron Microscope, North China Coal Medical College, Tang shan 063000;4 Affiliated hospital of North China Coal Medical College, Tang shan 063000;5 Department of computer, North China Coal Medical College, Tang shan 063000
  • Received:1900-01-01 Revised:1900-01-01 Online:1998-08-28 Published:1998-08-28

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Abstract: AIM: To study the transformation of taeniid spermatozoon during spermatogenesis on
the ultrastructure level. METHODS: Transmission electronmicroscopy.RESULTS: This paper was the
second part of the ultrastructural observations on the spermatogenesis in Taeniid cestodes: The
transformation of the spermatozoon.The 64 spermatid plasmodium was generated from the secondary
meiosis of the 32 rose like secondary spermatocytes. The transformation of the spermatozoon was
a complex process. Firstly, both the cytoplasm and nucleus of the spermatide longated while the cytoplasm increased and connected to the cytoplasmic mass (cytophore). Secondly, the chromatins of nucleus polymerized to a thread-bundle-like structure. Finally, it detached from the cytoplasm mass and became a mature spermatozoon. The mature spermatozoon was a thread-like structure, about 16.2- 18.6μm in length and 0.35 - 0.45 μm in diameter. There were two structurally distinct parts: the part with the nucleus was the head and the part without the nucleus was the tail. The head measured about 5- 6 μm in length, 1/3 of the total body length and contained an elongated nucleus which twined around the axoneme without mitochondria. The tailw as about 11.2- 16.6 μm in length. Throughout the core of the tail was an axoneme with typical“9+ 1”structure. The anterior of the tail, just behind the head, were some mitochondria, about 1.6- 1.7 μm in total length which twined around the axoneme. The posterior of the tail contained only an axoneme. In cross-section of the spermatozoon, about 46 microtubules were beneath the plasma membrane. CONCLUSION: The transformation of the spermatozoon is a very complex process.

Key words: Teania solium, Teania saginata, Teania pisiformis, spermatogenesis