Human Embryology 5 - Development of the Cardiovascular System

Question 1

At the middle of the 3rd week after fertilization, the mesenchyme cells in the wall of the yolk sac proliferate and form isolated cell clusters called

Answer 1

Blood island

Question 2

These cells become flattened and differentiate into endothelial cell to form endothelial tube

Answer 2

Peripheral cells

Question 3

Proliferate and become the primitive blood vessels

Answer 3

central cells

Question 4

Definition: to grow by rapid production of new parts, cells, buds or offspring

Answer 4

Proliferate

Question 5

The formation of the primitive heart occurs on which day after fertilization?

Answer 5

18-19

Question 6

The two portions of the primitive heart:

Answer 6

1. Cardiogenic plate
2. Pericardial cavity

Question 7

The primitive heart wall has three layers, from inner to outer

Answer 7

1. Endocardium
2. Myocardium
3. Epicardium

Question 8

The primitive heart does not have which vital structures?

Answer 8

Atria and ventricles

Question 9

Three dilatations of the heart wall in the primitive heart

Answer 9

1. Bulbus cordis
2. Cardiac ventricle
3. Cardiac atrium

Question 10

Left ventricle originates from

Answer 10

Primary ventricle

Question 11

Right ventricle originates from

Answer 11

Proximal portion of the bulbus cordis

Question 12

Partitioning of the heart chambers occurs from

Answer 12

27th - 37th day after fertilization

Question 13

Diagram for labeling
- parts of the primitive atrium
remember for exam

Answer 13

1. Septum secundum
2. Foramen secundum
3. Foramen ovale
4. Endocardial cushion

Question 14

Partitioning of the primitive atrium

Answer 14

• 2 septums
• 3 foramens