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KMID : 0381920090390020089
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Korean Journal of Microscopy
2009 Volume.39 No. 2 p.89 ~ p.99
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Ultrastructural Observation on the Sperm of the Grey Red-blacked Vole, Clethrionomys rufocanus
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Lee Jung-Hun
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Abstract
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To investigate the morphological characteristics of spermatozoa of the grey red-blacked vole (Clethrionomys rufocanus) belongings to the subfamily Cricetinae, subgenus Clethrionomys were examined by scanning and transmission electron microscopes. The sperm head of C. rufocanus was an ax or hatchet in shape with a curved single dorsal hook. The total length of C. regulus sperm was 95.8 μm. The length of sperm head was 7.8 μm, and the tail (88.0 μm) consisted of four major segments: the neck (1.0 μm), middle piece (22.0 μm), and principal piece plus end piece (65.0 μm), respectively. The segmented columns were about 10~12 in number. The number of gyres of mitochondria ranged from about 170 to 178. The post-nuclear cap occupied about a half of nucleus. The equatorial segment is located between the post-nuclear cap segment and acrosomal cap on the nuclear surface. Nos. 1, 5 and 6 of the outer dense fibers were larger than the others. A fibrous sheath and longitudinal column of the principal piece were in evidence, but the fibrous sheath was not seen at the end piece. In conclusion, the morphological structures of sperm head and tail may be useful information to patterning of sperm evolution and classifying of species.
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KEYWORD
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Clethrionomys rufocanus, Sperm, Acrosome, Mitochondrial gyres
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