ニシン卵の受精の研究 : III.精子の卵内進入過程

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(1) The spermatozoa of the herring (Clupea pallasii), unlike those of most marine animals, are almost motionless even after they are set free in sea water or in Ringer's solution. (2) However, when these spermatozoa are brought in contact with the surface of egg membrane around the micropyle of mature egg, they begin to move actively (cf. figs. 3-5). Within 5 or 10 seconds following insemination, a number of activated spermatozoa find their way into the micropyle, with the result that fertilization occurs. These facts show that a specific agent (probably Gynogamone I) which makes the sperm active and directs them into the egg exists around the micropyle of mature egg. (3) Successive steps of entrance of sperm into to egg are shown in Figure 6. (4) The fertilization of the herring egg is monospermic. Immediately after the penetration of an effective spermatozoon into the egg cortex, a change is provoked at the bottom of the micropyle wich renders the egg inpenetrable to additional spermatozoa (cf. Fig. 6 b-c). (5) In about 2 to 3 minutes after the penetration of the effective spermatozoon, the cortical alveoli embedded in the cortical cytoplasm begin to disappear and subsequently the formation of the perivitelline space takes place. About 30 to 40 minutes afterwards, the supernumerary spermatozoa lying in the micropyle are extruded. A typical case of the extrusion is shown in Figure 7. (6) Masses of agglutinated spermatozoa are frequently seen in the vicinity of the micropyle of the developing egg (Fig. 9). In aggulutination, the spermatozoa stick together by their heads.
社団法人日本動物学会の論文
1957-05-15

ニシン卵の受精の研究 : III.精子の卵内進入過程

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