Inner sex organs of woman were excised in surgical operation. Embryo which consists of 16 tightly packed blastomeres was found in histological research of these organs. It is cowered with special tunica. What is the name of this tunica?

Inner sex organs of woman were excised in surgical operation. Embryo which consists of 16 tightly packed blastomeres was found in histological research of these organs. It is cowered with special tunica. What is the name of this tunica?

1.  Corona radiata


2.  Zona pellucida


3.  Plasmalemma


4.  Oolemma


5.  *Tunica of fertilization