Embriology 1

Question 1

Answer 1

Mesenchymal connective tissue – dental pulp

(different stages of tooth development)

Question 2

Answer 2

length about 50 cm
- connects the bloodstream of the fetus and the placenta (serves to nourish the fetus)

Question 3

Answer 3

Question 4

Answer 4

Question 5

Answer 5

Question 6

Answer 6

Question 7

Answer 7

Question 8

Answer 8

Question 9

Answer 9

Question 10

Answer 10

• Discoid in shape, about 20 cm in diameter
• It consists of the fetal and the maternal part
• The fragment of the fetal part that faces the fetus is smooth and consists of the chorionic plate (cannot be seen in this specimen)

Question 11

Answer 11

From the chorionic plate larger tertiary chorionic villi branch into the intermediate villi and afterwards to smaller terminal chorionic villi.

Question 12

Answer 12

Between the chorionic villi is the intervillous space in which the mother’s blood is circulating.
Through this blood, oxygen, nutrients, hormones, antibodi and vitamins are delivered to the fetus through the chorionic villi.

Question 13

Answer 13

The maternal part represents the decidually altered endometrium of the uterus, which is uneven, and is made up of the decidua basalis.

Question 14

Answer 14

Decidual cells are altered stromal cells of the endometrium that are surrounded by an eosinophilic substance composed of fibrinoid.

Question 15

Answer 15

The inner surfaces of the chorionic plate, chorionic villi and decidua are lined with a special cuboidal epithelium - trophoblast.
In the chorionic villi there is a stroma of the chorionic villi (loose connective tissue) with the blood vessels of the fetus.

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Answer 16

Question 17

Answer 17

Question 18

Answer 18