Development of Nervous system

Question 1

At the beginning of the 3rd week, ectoderm thickens to form the ________

Answer 1

neural plate

Question 2

Fusion of neural folds begins in the ________ and proceeds in cephalic and caudal directions. At the end of this fusion, the cranial and caudal neuropores are visible

Answer 2

5th somite

Question 3

The cells that form the early neural tube are called the ___________

Answer 3

Neuroepithelial cells

Question 4

Once the neuroblasts are formed, they lose their ability to divide. They start arranging themselves in different layers thus giving rise to: ___________ and ___________.

Answer 4

Mantle layer; Marginal layer

Question 5

Below the mantle and the marginal layers- the __________ still exists

Answer 5

neuroepithelial layer

Question 6

As a result of myelination of nerve fibers, the marginal layer appears white and is called the ___________

Answer 6

white matter of the spinal cord.

Question 7

Dorsal alar plates form the ??

Answer 7

Sensory areas

Question 8

Ventral basal plates form the ??

Answer 8

motor areas of the spinal cord

Question 9

marks the boundary between the Alar and the Basal plates

Answer 9

Sulcus limitans

Question 10

What are the 3 neuroblast types?

Answer 10

Apolar
bipolar
Neuropolar

Question 11

Neuroepithelial cells can differentiate into?

Answer 11

Neuroblasts or Glial cells

Question 12

Neural crest cells originate from the __________

Answer 12

Neural Folds

Question 13

Neural crest/Neural tube or neural tissue originally came from the _________-

Answer 13

ectoderm

Question 14

What forms after the neuroblasts stop forming?

Answer 14

Gliablasts

Question 15

Ependymal cells secrete what?

Answer 15

CSF

Question 16

phagocytic in nature formed from monocytes are?

Answer 16

Microglia

Question 17

Gliablasts can give rise to what 3 tissues?

Answer 17

Oligodendroglia, Fibrillar astrocyte (white matter), & Protoplasmic astrocyte (Grey matter)

Question 18

Cells of the dorsal root ganglia form two processes. What are they?

Answer 18

Central process
Peripheral process

Question 19

considered to be the 4th germ layer of the body

Answer 19

Neural Crest Cells

Question 20

In the spinal cord, the central process ends in the dorsal horn or ascend through the marginal layer to one of the higher brain centers. These processes are known collectively as the ________________________

Answer 20

dorsal sensory root of the spinal nerve

Question 21

The peripheral process join the ventral motor roots and participates in formation of the _________

Answer 21

trunk of the spinal nerve

Question 22

The cephalic end of the neural tube shows three dilations. the three primary brain vesicles. What are they?

Answer 22

Prosencephalon, or forebrain
Mesencephalon, or midbrain
Rhombencephalon, or hindbrain

Question 23

The neural tube forms two flexures. What are they?

Answer 23

Cephalic flexure in the midbrain region
Cervical flexure at the junction of the hindbrain and the spinal cord

Question 24

The telencephalic vesicles, following the development of the optic vesicles, turns into the telencephalon. This develops the what?

Answer 24

Cerebral hemispheres

Question 25

the optic cup makes the ?

Answer 25

Retina and optic nerve

Question 26

The cavities of the telencephalic vesicles become the _____?

Answer 26

lateral ventricles

Question 27

The posterior part of the forebrain becomes the __________?

Answer 27

diencephalon

Question 28

The cerebral hemispheres are in communication with the third ventricle through ________________

Answer 28

Foramen of Monro (interventricular foramen)

Question 29

Formed by neuroblasts from the alar and the basal plates migrating into the marginal layer

Answer 29

The colliculi

Question 30

The primordia develop into the

Answer 30

Superior and inferior colliculi

Question 31

The pontine flexure causes the roof plate to depress, flattening the entire structure out and the ___________ is formed.

Answer 31

Fourth Ventricle

Question 32

Basal plates give rise to _______ neurons

Answer 32

motor

Question 33

Alar plates give rise to ______ neurons

Answer 33

sensory