CHANGES IN THE OVARY 



121 



over the nuclear region, (b) Synaptenic stage. — The filaments 

 become congregated together in the form of a lump, or dark 

 mass, heaped up at one side of the nuclear region, (c) Pachytenic 



Pachytenic stage. 



Fig. 26. — Developing ova from ovary one day after birth. (After 

 Lane-Clay pon.) 



stage. — The nuclear filaments again become unwound, and 

 spread themselves out over the whole nuclear region ; they are, 

 however, considerably coarser than in the earlier stages. 

 (d) Diplotenic stage. — The chromatin strands split along their 



«iBP^ 



Diplotenic nucleus three 

 days after birth. 



Dictyate nucleus seven 

 days after birth. 



Fig. 27. — Developing ova. (After Lane-Claypon.) 



whole length, and the two halves of each strand at first he in 

 pairs near to one another, (e) Dictyate stage. — The split 

 strands pass away from one another, and the chromatin generally 

 becomes distributed once more throughout the nuclear region 

 in the form of a reticulum. 



