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기수재첩 (Corbicula japonica)의 정자형성과정과 정자 미세구조

Spermatogenesis and Sperm Ultrastructure of the Marsh Clam (Corbicula japonica) (Bivalvia: Veneridae)

김완기|장영진|이정용|이채성
한국수산과학회 (The Korean Society of Fisheries and Aquatic Science)|2004.08|한국수산과학회지 (Korean Journal of Fisheries and Aquatic Sciences)|제37권 제4호|pp. 281-286

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참고문헌

주제분류수산학

초록

Abstract

Spermatogenesis and sperm ultrastructure of the marsh clam (Corbicula japonica) were investigated by electron microscopic observations. Testis of the marsh clam consists of numerous spermatogenic follicle containing germ cells in the different developmental stages. Spermatogonia are located nearest the outer wall of the follicle, while spermtocytes and spermatids are positioned nearer to the lumen. Spematogonia are oval-shaped and about 5μm in diameter. Spermatogonia develop into spermatocyte, spermatid and spermatozoon. In the spermatid to about 2μm in diameter, cytoplasm decreases and mitochondria move to the base of the nucleus and fuse into several spheres, the centrioles become orthogonally oriented, a flagellum appears, and an acrosomal vesicle forms. The mature sperm has primitive type, consisting of a head, a midpiece and a tail. The sperm was arrow-shaped, and its head is about 8μm long and comprised of a long nucleus and an acrosome. The four mitochondria encircled the centrosome in midpiece. The flagellum had the classical 9＋2 axoneme structure, and axonemal lateral fins in the tail were observed.

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