Question

Myometrium Umbilical cord Stratum basalis of endometrium Chorion Chorionic villus Decidua basalis

Answer 1

• Placenta is a disc shaped connecting organ between the fetus and the mother.
• It helps in exchange of nutrients, wastes, respiratory gases, hormones, antibodies etc between the fetus and the mother.
• The placenta can be categorized into two portions, namely- maternal portion and fetal portion.
• The maternal portion of placenta is called decidua basalis.
• The endometrium of uterus is called decidua. It consists of two layers, namely- stratum basalis and stratum functionalis. The stratum basalis lies just next to the myometrium.
• The decidua basalis is the layer found between decidua/endometrium and the myometrium of the uterus.
• The fetal portion of placenta is called chorion. It is made up of cells called trophoblast.
• The chorion consists of finger like projections called chorionic villi. They lie in the space called intervillous space and are surrounded by the maternal blood.
• Within the chorionic villi, fetal blood capillaries can be found.
• Exchange of nutrients, gases, hormones, wastes etc occurs between fetal and maternal blood at the chorionic villi in the intervillous space.
• The fetus is attached to the placenta through the umbilical cord. This cord consists of one umbilical vein and two umbilical arteries.

1.Chorionic villus 2. Umbilical cord 3. Myometrium 4. Stratum basalis of endometrium 5. Decidua basalis 6. Chorion