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KMID : 0381920070370030185
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Korean Journal of Microscopy
2007 Volume.37 No. 3 p.185 ~ p.198
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Spermiogenesis in the Crocidura dsinezumi
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Jeong Seung-Don
Lee Jeung-Hoon
Oh Hong-Sik
Kim Sang-Sik
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Abstract
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Spermiogenesis in Japanese white-toothed shrew, Crocidura dsinezumi was investigated by transmission electron microscope. Spermiogenesis was divided into 12 phases 14 steps, based on the morphological features of the nucleus and change of organelles in cytoplasm. The nucleus of spermatids in Golgi (step 1~2) phase were spherical; however, they were changed into oval in the cap (step 3~6) phase. Flagellum appeared in the middle of acrosomal phase; on the other hand, slender and long spermatid head was formed in maturation phase. The head of spermatids faced the lumen in step 1 to step 6 (from Golgi to cap phase), but, in step 7 to step 14 (from acrosomal to spermiation phase), it turned its head to the basal lamina of the seminiferous epithelium. The nucleus and acrosome were elongated maximally in step 10. The condensation of chromatin started in late acrosomal (step 10) phase, and it was completely finished and homogenized in the middle of maturation (step 12) phase. Multivesicular body appeared near the acrosomal vacuole during the middle cap (step 5) phase, and a large number of them were observed near the Golgi apparatus in the late cap (step 6) phase. Considering all the results, the spermiogenesis might be useful information to analyse the differentiation of spermatogenic cells.
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KEYWORD
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Spermiogenesis, Shrew, Crocidura dsinezumi
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