Archive image from page 50 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 Fig. 9. — Vertical section of the germinal vesicle and part of the germinal disc of an ovarian ovum | inch in diameter; pigeon, x 385. (After Harper.) Chr., Chromosomes. Gr., Granulosa. G. V., Wall of germinal vesicle. vesicle. The first maturation spindle is formed before ovulation, containing eight quadruple chromosomes (tetrads). The spindle is still in the equatorial plate stage when the ovum is grasped by the mouth of the oviduct (Fi
Archive image from page 50 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 Fig. 9. — Vertical section of the germinal vesicle and part of the germinal disc of an ovarian ovum | inch in diameter; pigeon, x 385. (After Harper.) Chr., Chromosomes. Gr., Granulosa. G. V., Wall of germinal vesicle. vesicle. The first maturation spindle is formed before ovulation, containing eight quadruple chromosomes (tetrads). The spindle is still in the equatorial plate stage when the ovum is grasped by the mouth of the oviduct (Fig. 10). The bulk of the substance of the ger- minal vesicle soon forms a yolk-free cone extending from the maturation spin- dle deep into the superficial yolk. The outer end of the Fig. 10. — Vertical section of the germinal spindle is in almost imme- fhc of the pigeon's egg showing the diate contact with the sur- maturation spindle. The egg was . clasped by the funnel or the oviduct, face of the ovum. In the g 2OOO. (After Harper.) later stages of formation of 1, First maturation spindle. Tetr., the first polar body each Tetrad. tetrad, or quadruple chromosome, separates into two dyads or double chromosomes, and the members of each pair of dyads separate and approach opposite ends of the spindle (anaphase).
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