Fertilization

Fertilization is the process of fusion of the spermatoon with the mature ovum.

Zygote

A diploid cell resulting from the fusion of two haploid gametes, a fertilization ovum

Morula

A solid ball of cells resulting from decision of a fertilized ovum and from which blastula is formed.

Blastocyst

By the fifth or sixth day, the fertilized egg is known as blastocyst, which consists of two groups.

The inner group of cells, which will become the embryo.

The outer group of cells, which will become the placenta.

Trophoblast

A protective layer outside the blastocyst, supplying the embryo with nourishment and forming the part of placenta.

Cytotrophoblast

The inner cellular layer of the trophoblast around the embryo last and that gives rise to syncytiotrophoblast which surround placental villi.

Syncytiotrophoblast

A continuous specialized layer of epithelial cells that cover the entire surface of villous tree and are in direct contact of maternal blood.

Lacunae

Syncytiotrophoblast has opened up space around it called lacunae which get filled with maternal blood.

Embryo

The developing offspring is termed as embryo until eighth week of implantation.

Chorion

Chorion is the outermost layer of two fetal membranes

Decidua

The decidua is the endometrium of pregnant uterus.It is so named because much of it is she’d following delivery.It is 10mm thick.

Placenta

The placenta is an organ that develops during pregnancy .The structure provides oxygen and nutrients to a growing baby. It also removes waste products from baby’s blood.