Embryology

Question 1

When does the nervous system begin to development?

Answer 1

3rd week

Question 2

What layer of the trilaminar disc is the nervous system derived from?

Answer 2

Ectoderm

Question 3

How does the neural plate form?

Answer 3

Notochord secretes growth factors which stimulate differentiation of overlying ectoderm into neuroectoderm
This forms neural plate

Question 4

How does the neural tube form?

Answer 4

Lateral edges of neural plate rise to form neural folds
Neural folds fuse to form neural tube

Question 5

What is the neural tube a precursor to?

Answer 5

Brain and spinal cord

Question 6

What are neural crest cells?

Answer 6

Cells within the neural folds that migrate to form a distinct cell population
Give rise to a diverse cell lineage

Question 7

What is neurulation?

Answer 7

Formation of neural tube
Done by end of 4th week of development

Question 8

What are the 3 primitive vesicles that swell from the cranial end of the neural tube?

Answer 8

Prosencephalon
Mesencephalon
Rhombencephalon

Question 9

What secondary vesicles are formed from the prosencephalon?

Answer 9

Telencephalon
Diencephalon

Question 10

What secondary vesicle is formed from the mesencephalon?

Answer 10

Mesencephalon

Question 11

What secondary vesicles are formed from the rhombencephalon?

Answer 11

Metencephalon
Myelencephalon

Question 12

What does the telencephalon give rise to?

Answer 12

Cerebral hemispheres
Globus pallidus
Lateral ventricles

Question 13

What does the diencephalon give rise to?

Answer 13

Thalamus
Hypothalamus
Epithalamus
Third ventricle

Question 14

What does the mesencephalon give rise to?

Answer 14

Midbrain
Cerebral aqueduct

Question 15

What does the metencephalon give rise to?

Answer 15

Pons
Cerebellum
Upper part of fourth ventricle

Question 16

What does the myelencephalon give rise to?

Answer 16

Medulla
Lower part of fourth ventricle
Central canal

Question 17

What does the caudal end of the neural tube form?

Answer 17

Spinal cord