Stage 7 (3 hrs 30 min)
32 cell stage
Drown by T. Iwamatsu
(Abbr. )
Stage 7 (3 hrs 30 min) 32 cell stage:
The fifth cleavage plane divides the marginal 12blastomeres meridionally into 24, and the central 4 blastomeres horizontally into 8 thereby forming 2 layers, an outer and an inner layer, in the central region. The number of marginal cells is 14. These observations agree with those of Matui [24], Gamo and Terajima [4] and Iwamatsu [11] but differ from the earlier reports of Kamito [21, cf. 30] in which cleavage was reported to continue to occur meridionally at least through the 32 cell stage.