Neuroscience Week 3: Brainstem and Cranial Nerves

Question 1

Identify

Answer 1

Question 2

Oculomotor nerve #

Answer 2

CN III

Question 3

Oculomotor nerve Exits the CNS by

Answer 3

Exits the midbrain near the midline

Question 4

Oculomotor nerve Key Function

Answer 4

• Medial, superior, inferior recti muscles
• Inferior oblique
• Levator palpebrae
• Pupil constriction

Question 5

Midline brainstem strokes often damage this nerve

Answer 5

Oculomotor Nerve

Question 6

Abducens Nerve #

Answer 6

CN VI

Question 7

Abducens Nerve Exits the CNS

Answer 7

near the midline of pontomedullary junction

Question 8

Abducens Nerve Key Functions

Answer 8

Lateral Rectus

Question 9

Hypoglossal Nerve #

Answer 9

CN XII

Question 10

Hypoglossal Nerve Exits CNS

Answer 10

emerges paracentrally from mid medullary level along the midline

Question 11

Hypoglossal Nerve Key Function

Answer 11

Tongue activation

Question 12

Spinal Accessory Nerve #

Answer 12

CN XI

Question 13

Spinal Accessory Nerve Exits the CNS

Answer 13

emerges laterally from the cervical spinal cord

Question 14

Spinal Accessory Nerve Key Function

Answer 14

• Head turn
• shoulder shrug (Trapezius)

Question 15

Trochlear Nerve Key Function

Answer 15

Superior oblique

Question 16

Trochlear Nerve #

Answer 16

CN IV

Question 17

Trochlear Nerve Exits CNS from

Answer 17

wrap around the outside of the pons but originates from the midline of the lower midbrain

it is the only cranial nerve that decussates and crosses the midline and travels the opposite side of origin

……………………………….

decussates (crosses midline) as it exits the brainstem contralateral (on the side opposite) to its side of origin – it’s the only CN to make this decussation.

Question 18

IF someone has a head tilt it may be caused from?

Answer 18

attempt to correct eye alignment due to a Trochlear nerve injury

Question 19

Cranial Nerve Groups

Answer 19

somatomotor set - CNs 3, 4, 6, 12, 11 all innvervate midline muscularture

Solely Special Sensory Set - CNs 1, 2, 8

Pharyngeal Arch Set - CNs 5, 7, 9, 10

Question 20

Optic Nerve #

Answer 20

CN II

Question 21

Optic Nerve Function

Answer 21

Vision

Question 22

Infundibulum can enlarge and damage

Answer 22

optic chiasm

Question 23

Vestibulocochlear Nerve Function

Answer 23

Hearing and balance

Question 24

Vestibulocochlear Nerve #

Answer 24

CN VIII

Question 25

Identify

Answer 25

Question 26

Vestibulocochlear Nerve Exits CNS from

Answer 26

posterior Medulla

Question 27

Trigeminal Nerve Function

Answer 27

Motor innervation for mastication

facial sensation

Question 28

Trigeminal Nerve # 5

Question 29

Trigeminal Nerve Exits CNS from

Answer 29

Posterior Pons

Question 30

Facial Nerve Key Functions

Answer 30

Facial movement and taste on anterior 2/3 of tongue

Question 31

Facial Nerve #

Answer 31

CN VII

Question 32

Facial Nerve Exits CNS from

Answer 32

superior posterior medulla

Question 33

Facial palsy AKA

Answer 33

Facial droop

Question 34

Glossopharyngeal Nerve #

Answer 34

CN IX

Question 35

Glossopharyngeal Nerve Key Functions

Answer 35

• Swallowing
• cardio-pulmonary functioning
• Salivation

Question 36

Glossopharyngeal Nerve Exits CNS from

Answer 36

posterior mid medulla

Question 37

Vagus Nerve #

Answer 37

CN X

Question 38

Vagus Nerve Exits CNS from

Answer 38

posterior mid medulla

Question 39

Vagus Nerve Key Functions

Answer 39

• Cardio/pulmonary
• Swallowing
• Gut motility