Neurodevelopment 1

Question 1

Trilaminar parts of the third week

Answer 1

-Ectoderm
-Mesoderm
-Endoderm

Question 2

Ectoderm

Answer 2

Skin and nervous system

Question 3

Mesoderm

Answer 3

Muscles, connective tissue, skeleton

Question 4

Endoderm

Answer 4

Digestive and respiratory tracks

Question 5

Neural tube

Answer 5

-Develop into brain and spinal cord
-Has an alar plate and basal plate
-Rosral 2/3 becomes brain
-Caudal 1/3 becomes spinal cord

Question 6

Alar plate

Answer 6

-Will form sensory portions of the spinal cord (dorsal horn)

Question 7

Basal plate

Answer 7

-Will form motor portions of the spinal cord (ventral horn)

Question 8

Proencephalon becomes…

Answer 8

Telencephalon and Diencephalon

Question 9

Telencephalon contains

Answer 9

-Cerebral hemispheres
-Basal Ganglia
-Limbic lobe

Question 10

Diencephalon contains

Answer 10

-Thalamus
-Hypothalamus

Question 11

Mesencephalon becomes

Answer 11

Midbrain

Question 12

Rhombencephalon becomes

Answer 12

Hindbrain
-Pons
-Cerebellum
-Medulla

Question 13

Developing connections

Answer 13

-Neurons search out the appropriate connections
-This is done by the growth cone
-This is guided by chemical signals
–Attractive cues
–Repulsive cues

Question 14

Pruning

Answer 14

-All the neurons are there by the 25th gestational week
-After this point brain growth reflects increased synaptic connections and myelination
-Gradually, the number of neurons and the number of connections decreases (pruning)
-This is critical for learning