重庆医科大学：《组织胚胎学》课程图片库（胚胎学）胚胎学总论（一）

受精卵 37C.com.cn

受精卵

Phase 1 Acrosome reaction Phase 2 0 Penetration and recognition Acrosome Sperm nucleus Plasma membrane Membrane fusion and entry Phase 3

X Girl Y= Boy

12 Single cell Hours

卵裂 e海g18Un 30 Two cell stage Hours

卵裂