Cranial Nerves

Question 1

12 paired nerves that emerge from the CNS via the _____________

Answer 1

cranium’s foramina

Question 2

The 12 paired nerves innervate structures of the __________, __________, __________ & _____________.

Answer 2

1.) head
2.) neck
3.) thorax
4.) abdomen

Question 3

What is the numerical order of the nerves determined by?

Answer 3

their skull exit location rostral to caudal

Question 4

What types of functions can cranial nerves have?

Answer 4

Sensory
Motor
BOTH

Question 5

__#__ out of 12 CNs have their nuclei (originate) in the brain stem

Answer 5

10

Question 6

Where does the CN III and IV originate from?

Answer 6

midbrain

Question 7

Where does the CN V, VI, VII, and VIII originate from?

Answer 7

pons

Question 8

Where does the CN IX, X, and XII originate from?

Answer 8

medulla

Question 9

Where does the CN I and II directly innervate the brain from?

Answer 9

nose and eyes

Question 10

Where does the CN XI originate from?

Answer 10

cervical spine

Question 11

What is CN I ?

Answer 11

Olfactory

Question 12

CN I special sensory nerve

Answer 12

olfaction

Question 13

Which nerve originates from the olfactory epithelium in the nose and synapses in the olfactory bulb?

Answer 13

CN I

Question 14

What is the function of the CN I ?

Answer 14

Mediates the processing of odorant information

Question 15

What is CN II?

Answer 15

Optic

Question 16

CN II special sensory nerve

Answer 16

vision

Question 17

Which CN originates in the retina and synapses with the lateral geniculate nucleus. It becomes the optic tract at the optic chiasm

Answer 17

CN II

Question 18

What is the function of the CN II ?

Answer 18

Mediates the processing of visual information

Question 19

What is CN III ?

Answer 19

Oculomotor

Question 20

The CN III nerve innervates muscles of the eye and regulates:

Answer 20

1. eyeball movement (up, down, medial)
2. pupil constriction
3. eyelid movement

Question 21

What is CN IV?

Answer 21

trochlear (motor function of the eye)

Question 22

Which nerve innervates a single eye muscle (superior oblique) to regulate eye movement in, downwards (e.g. reading)?

Answer 22

CN IV (trochlear)

Question 23

What is CN V?

Answer 23

Trigeminal

Question 24

What are CN V functions and what three regions are they branched into?

Answer 24

Functions: sensory and motor
Regions:
1.) ophthalmic (V1=sensory)
2.) maxillary (V2=sensory)
3.) mandibular (V3= sensory and motor)

Question 25

What is CN VI?

Answer 25

abducens

Question 26

What is the main idea and function of CN VI?

Answer 26

motor function of the eye

Question 27

Which nerve innervates the Visceral afferents

Answer 27

CN VI (abducens)

Question 28

What is CN VII called?

Answer 28

facial

Question 29

What are the functions and 5 regions that it branches into?

Answer 29

Function: sensory and motor
Regions:
1.) temporal (motor)
2.) zygomatic (motor)
3.) buccal (sensory)
4.) mandibular (motor)
5.) cervical (motor)

Question 30

CN ___ is mostly a facial SENSORY nerve, while CN ___ is mostly a facial MOTOR nerve.

Answer 30

V (trigeminal)
VII (facial)

Question 31

What is CN VIII?

Answer 31

vestibulocochlear

Question 32

What is the special sensory nerve of the vestibulocochlear (CN VIII)?

Answer 32

audition

Question 33

Which nerve originates as the vestibular and cochlear nerves in the inner ear.

Answer 33

CN VIII: vestibulocochlear

Question 34

What is the main function of CN VIII: vestibulocochlear?

Answer 34

Mediates the processing of sounds and vestibular information.

Question 35

What is CN IX called?

Answer 35

glossopharyngeal

Question 36

Is the glossopharyngeal CN sensory, motor or both?

Answer 36

BOTH

Question 37

What are the main functions of CN IX (glossopharyngeal)? (3 things)

Answer 37

1.) Motor function of tongue and pharynx
2.) Regulates gag reflex and salivation
3.) Taste on posterior 2/3 of tongue

Question 38

What is CN X called?

Answer 38

vagus

Question 39

Does the vagus nerve (CN X) have sensory, motor, or both functions?

Answer 39

BOTH

Question 40

What are the purposes of the vagus nerve (CN X)?

Answer 40

1.) Parasympathetic sensory and motor control of visceral organs of the respiratory, digestive, and urinary systems

Question 41

What is XI CN called?

Answer 41

accessory

Question 42

What is the function of the CN XI (accessory)?

Answer 42

motor function of the neck and shoulders

Question 43

What is CN XII called?

Answer 43

hypoglossal

Question 44

What is the function of CN XII (hypoglossal)?

Answer 44

motor function of the tongue

Question 45

Which nerve controls the the movements and shape of the tongue during speech and swallowing?

Answer 45

CN XII (hypoglossal)