Anatomy Introduction and gametogenesis. a4ae7be1 Morula reaches uterus at A 3rd day after feilization B 4th day after feilization C 6th day after feilization D 8th day after feilization High-Yield Explanation Morula is 16 cell structure and reaches uterus by 4th day of feilisation. Soon divisions occurs and blastocyst is formed which is 64 celled structure by day 6.