Rotational Movement of a Spermatozoon Around Its Long Axis

精子 顺时针方向的 解剖 鞭毛 仓鼠 海星 海胆 生物 旋转(数学) 长轴 地质学 物理 细胞生物学 超微结构 几何学 古生物学 数学 分子生物学 细菌
作者
Sumio Ishijima,Miyako S. Hamaguchi,Masakazu Naruse,Sanae A. Ishijima,Yukihisa Hamaguchi
出处
期刊:The Journal of Experimental Biology [The Company of Biologists]
卷期号:163 (1): 15-31 被引量:77
标识
DOI:10.1242/jeb.163.1.15
摘要

The rotational movement of a spermatozoon around its longitudinal axis was investigated by two methods: by observing a spermatozoon attached vertically to a coverslip by the tip of its head, and by observing a spermatozoon freely swimming in a medium by means of 'double-focal microscopy', which yielded simultaneous images at two different focal planes. Similar results were obtained by these two methods. Sea urchin, starfish, medaka, human, golden hamster and bull spermatozoa rolled in both clockwise and counterclockwise directions, although there was a large difference in the proportion of spermatozoa rolling in each direction in the different species. The majority of sea urchin and starfish spermatozoa rolled in a clockwise direction when an observer viewed the cell from its anterior end, whereas the majority of medaka, golden hamster, human and bull spermatozoa rolled in a counterclockwise direction relative to the same observer. Moreover, some spermatozoa occasionally changed their rotational direction. These results suggest that the mechanism regulating the direction of rotation of the spermatozoa is lax. As rotational movement of a spermatozoon around its longitudinal axis is due to the three-dimensional component of the beat of the flagellum, the direction of the three-dimensional movement presumably changes as the spermatozoa swim.
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