MICROANATOMY

Detailed explanation-1: -During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst . The blastocyst then burrows into the uterine lining-a process called implantation.

Detailed explanation-2: -Implantation. Once the embryo reaches the blastocyst stage, approximately five to six days after fertilization, it hatches out of its zona pellucida and begins the process of implantation in the uterus.

Detailed explanation-3: -The stages of fertilization can be divided into four processes: 1) sperm preparation, 2) sperm-egg recognition and binding, 3) sperm-egg fusion and 4) fusion of sperm and egg pronuclei and activation of the zygote.

Detailed explanation-4: -The zygote undergoes several divisions and turns into a multicellular embryo. This embryo gets implanted into the uterine wall for further development. The nourishment and other requirements are drawn from the uterine wall rich in blood vessels.