Nervous System Embryolgy

Question 1

When does the nervous system begin developing?

Answer 1

Week 3

Question 2

What layer is the nervous system developed from?

Answer 2

Ectoderm

Question 3

What structure does the nervous system develop from?

Answer 3

Neural tube

Question 4

What happens at the caudal end of the neural tube?

Answer 4

Forms spinal cord

Cells on dorsal side form dorsal horn

Cells on ventral side from ventral horn

Question 5

How does the cauda equina develop?

Answer 5

Vertebral column grows faster than spinal cord so spinal nerves pulled down

Question 6

What happens at the cranial end of the neural tube?

Answer 6

3 primitive vesicles appear - then develop into 5 secondary vesicles

Question 7

What are the primary vesicles?

Answer 7

Prosencephalon
Mesencephalon
Rhombencephalon

Question 8

What secondary vesicles form from the prosencephalon?

Answer 8

Telencephalon

Diencephalon

Question 9

What secondary vesicles form from the mesencephalon?

Answer 9

Mesencephalon

Question 10

What secondary vesicles form from the rhombencephalon?

Answer 10

Metencephalon

Myelencephalon

Question 11

What is derived from the telencephalon?

Answer 11

Cerebral hemispheres

Question 12

What is derived from the diencephalon?

Answer 12

Thalamus

Question 13

What is derived from the mesencephalon?

Answer 13

Midbrain

Question 14

What is derived from the metencephalon?

Answer 14

Pons

Cerebellum

Question 15

What is derived from the myelencephalon?

Answer 15

Medulla oblongata

Question 16

How do the ventricles develop?

Answer 16

Cavity derivatives from secondary vesicles