Anatomy General obstetrics 68ed196b Zona hatching occurs: A 4 days after feilisation B 5 days after feilisation C 6 days after feilisation D 8 days after feilisation High-Yield Explanation Zona hatching occurs just before the implantation i.e,5 days after feilisation. Ref: Datta textbook of Obstetrics - 9e pg24.