Archive image from page 90 of Cytology, with special reference to. Cytology, with special reference to the metazoan nucleus cytologywithspec00agaruoft Year: 1920 SYNGAMY 75 centrosome soon becomes visible in the middle piece, and an astral radiation appears round it. It next divides into two (if it has not already done so in the spermatid), a spindle figure being spun out between the two daughter centrosomes, and thus a complete achromatic figure is 'fi \ B D 'Jh Fig. 34. Syngamy in various animals. A, Pkysa fontanalis (after Kostanecki and Wierzejski, , 1896) just after entry of sp
Archive image from page 90 of Cytology, with special reference to. Cytology, with special reference to the metazoan nucleus cytologywithspec00agaruoft Year: 1920 SYNGAMY 75 centrosome soon becomes visible in the middle piece, and an astral radiation appears round it. It next divides into two (if it has not already done so in the spermatid), a spindle figure being spun out between the two daughter centrosomes, and thus a complete achromatic figure is 'fi \ B D 'Jh Fig. 34. Syngamy in various animals. A, Pkysa fontanalis (after Kostanecki and Wierzejski, , 1896) just after entry of spermatozoon ; B, the mouse (after Lams and Doorme, , 1908) spermatozoon in the act of entering the egg ; C, D, successive stages in the fusion of the gamete nuclei in Ophryotrocha puerilis (after Korschelt, , 1895); E, F, the penetration of the amoeboid spermatozoon in Ascaris canis (after Walton, , 1918). c, centrosome in middle piece ; h, head ; t, tail of spermatozoon. formed under the influence of the sperm centrosome. This is the achromatic figure of the zygote nucleus, for after the formation of the second polar body the entire achromatic figure of the egg, including the centrosomes, disappears. Thus the centrosome, and hence the whole achromatic figure of the zygote, is entirely derived from the spermatozoon. This conclusion is based on numerous observations, and also is well
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