Immunological System Embryology 1

Question 1

From what does the thymus arise?

Answer 1

The third Pharyngeal pouch

Question 1

What tissue forms the cortex and medulla of thymus?

Answer 1

The cortex is formed from the ectoderm and the medulla is formed from the endoderm

Question 2

Thymus - What happens after the cortex is formed from the ectoderm and the medulla is formed from the endoderm?

Answer 2

The stroma tissue is populated with lymphocyte precursors from bone marrow

Question 3

The spleen arises from which germ line?

Answer 3

Mesoderm

Question 4

What are present in the spleen by the first trimester?

Answer 4

Macrophages

Question 5

True or False: The spleen is capable of hematopoiesis during fetal life.

Answer 5

True, as well as after birth

Question 6

What germ layer forms the bone marrow?

Answer 6

Mesoderm

Question 7

Before bone marrow develops where are blood cells formed?

Answer 7

They start being produced in the yolk sac, then the liver takes over, and lastly the spleen handles the responsibility till the bone marrow matures.