Cranial nerve overveiw

Question 1

How many pairs of CN? numbered in what order?

Answer 1

12 pairs

rostral to caudal (frontal lobe to medulla)

Question 2

ALL cranial nerve except _____ are part of PNS?

Answer 2

1 and 2

Question 3

CN 1 and 2 are part of ?

Answer 3

CNS, because they are extensions of the forbrain

Question 4

all the cranial nerves are covered by? and all 3 layers of?

Answer 4

meninges and all layers of dura extend over the CN

Question 5

Why is CN 3-12 part of PNS?

Answer 5

because the nerves extend outside of the brain and spinal cord (whereas 1 and 2 are extentions of forebrain)

Question 6

all neural development is caused by?

Answer 6

external signalling

Question 7

Shh in notochord signals development of?

Answer 7

other cells and dissentigrates to become part of vertebral column

Question 8

What forms alar plate?

Answer 8

roof plate

Question 9

What form basal plate?

Answer 9

floor plate

Question 10

alar plate becomes?

Answer 10

posterior horn (sensory)

Question 11

basal plate becomes?

Answer 11

anterior horn (motor)

Question 12

Zone of autonomic neurons is located where and becomes?

Answer 12

located between alar and basal plate

becomes lateral horn (T1-L2)

Question 13

Ectoderm - _____ plate -_____ plate - ______ horn-____ matter= sensory or motor

Answer 13

ectoderm- roof plate- alar plate-posterior horn- gray matter- SENSORY

Question 14

Notochord - _____ plate -_____ plate - ______ horn-____ matter= sensory or motor

Answer 14

Notochord - floor plate -basal plate -anterior horn- gray matter= MOTOR

Question 15

anterior or posterior horn sensory or motor

Answer 15

anterior= motor
posterior= sensory

Question 16

sensory nuclei are located more medial or lateral?

Answer 16

sensory= lateral
motor= medial

Question 17

development of what pushes the roof plate laterally (dorsal) to the side?

Answer 17

4th ventricle

*ventricles make cerebral fluid

Question 18

motor or sensory = efferent or afferent

Answer 18

motor= efferent
sensory= afferent

Question 19

functional components of cranial nerves are defined and categorized by what 3 things?

Answer 19

1) efferent (motor) and afferent (sensory)
2) somatic or visceral
3) general or special