Embryonic Origin of Neuroanatomic Organization

Question 1

Endoderm

Answer 1

The precursor to epithelia of the GI, respiratory and urinary tract.

Question 2

Mesoderm

Answer 2

The precursor to muscle, skeletal, connective and cardiovascular tissues, the urogenital and hematopoietic systems, and some classes of microglia.

Question 3

Ectoderm

Answer 3

The embryonic precursor to skin, neurons, macroglia and ependymal cells that line the ventricles, and possibly some classes of microglia.

Question 4

Nueral Tube closes when? And what 3 structures are formed?

Answer 4

Closes within the first 3 weeks of life. This is also called the 3 vesicle stage because each contains a chamber.
Prosencephalon
Mesencephalon
Rhombencephalon

Question 5

What weeks do the the embryonic structures divide?

Answer 5

5-6

Question 6

What does the Prosencephalon divide into?

Answer 6

Telencephalon

Diencephalon

Question 7

What does the Telencephalon eventually become?

Answer 7

Left and right Cerebral Hemispheres

Question 8

What does the Diencephalon eventually become?

Answer 8

Thalamas and Hypothalamus

Question 9

What does the Mesencephalon become in the 5 vesicle stage

Answer 9

Mesencephalon (trick question)

Question 10

What does the Mesencephalon eventually become?

Answer 10

Midbrain

Question 11

What does the Rhombencepalon differentiate into?

Answer 11

Metencephalon

Myelencephalon

Question 12

What does the Metecephalon eventually become?

Answer 12

Pons

Cerebellum

Question 13

What does the Myelencephalon eventually become?

Answer 13

Medulla

Question 14

4 Types of Macroglia

Answer 14

Oligodendrocytes
Schwann Cells
Astrocytes
Ependymal Cells

Question 15

Oligodendricytes

Answer 15

Myelin Sheath around central nervous system axons

Question 16

Schwann Cells

Answer 16

Myelin Sheaths around peripheral system axons

Question 17

Astrocytes

Answer 17

Have may important structural and metabolic functions.

Question 18

Ependymal Cells

Answer 18

Line fluid filled cavities in the central nervous system. They play an important role in regulating the flow of chemicals from these cavities into the brain.