7/8- Cranial Nerves

Question 1

Damage to C1-5

Answer 1

UMN damage to all 4 limbs

Question 2

Damage to C6-T2

Answer 2

Legs- UMN damage

Arms- LMN damage

Question 3

Damage to T3-L3

Answer 3

Legs- UMN damage

Arms- Fine

Question 4

Damage to L4-S2

Answer 4

Legs- LMN damage

Arms- fine

Question 5

Damage to Olfactory Nerve

Answer 5

Anosmia- can’t smell

Conductive- problem with axon

Sensorineural- damage to pathway

Question 6

Inner Hair Cells

Answer 6

Principle source of sound info

Question 7

Outer Hair Cells

Answer 7

Controls sensitivity

Question 8

Pupillary Light Reflex/ Oculomotor Dx

Answer 8

Abnormal pupillary light response

Lack of constriction of pupil

Question 9

Function of VI

Answer 9

ABduction of eye

Innervates lateral rectus (ipsilateral)

Question 10

Function of XI

Answer 10

Shrugging shoulder

Turning head to contralateral side

Question 11

Supranuclear Damage to Hypoglossal Nerve

Answer 11

Weakness of contralateral muscles

Tongue moves away from side of damage

Question 12

Nucelar or Nerve Damage to Hypoglossal Nerve

Answer 12

Weakness of ipsilateral muscles

Tongues moves towards side of damage

Question 13

Sensory Territory of V

Answer 13

Skin of face

Mucous membrane

Teeth

Dura mater

Intracranial muscles

Question 14

Mesencephalic nuclei

Answer 14

Only CNS nucleus to contain unipolar sensory neurons

Question 15

V Has Motor Innervartion to

Answer 15

Mastication muscle

Tensor timpani (inner ear)

Tensor palati (soft palate)

Mylohyoid and digastric muscle (under jaw)

Question 16

Supranuclear Lesions to Facial Nerve

Answer 16

Contralateral motor weakness of lower face

Question 17

Nuclear Lesion to Facial Nerve

Answer 17

Complete facial and abducens paralysis on side of lesion

Can’t raise eyebrow, close eye, retract lip

Lesion in nucleus and nevre affects abducens nerve which innervates lateral rectus= can’t ABduct eye

Question 18

Bell’s Palsy

Answer 18

Complete paralysis on sid of lesion

Can’t raise eyebrow, close eye, retract lip

Question 19

Solitary Nucleus Receives Input From

Answer 19

Viscera

Taste buds (posterior 1/3)

Carotid body (chemoreceptor- monitors CO2,pH levels)

Carotid sinus (Monitor BP -Barr receptor)

Mucous Membranes

Question 20

VII Role in Taste

Answer 20

Soft Palate

Foliate papillae

Fungiform papillae

Question 21

IX Role in Taste

Answer 21

Circumvallate papillae

Foliate papillae

Question 22

X Role in Taste

Answer 22

Epiglottis

Question 23

Projection of Tastes

Answer 23

VII and IX go to VPM of thalamus, then go to gustatory ` in insula

Question 24

Where does olfactory nerve go in thalamus

Answer 24

Dorsomedial nucleus—> VPM—-> inferior salivatory nucleus

Question 25

Where does trigeminal nerve go in thalamus

Answer 25

VPM

Question 26

Where does Glossopharyngeal nerve go in thalamus

Answer 26

VPM

Question 27

Where does Vagus nerve go in thalamus

Answer 27

VPM and VPL

Question 28

In General, sensation from body goes to

Answer 28

VPL (via DCML and spinothalamic)

Question 29

In general, sensation from face goes to

Answer 29

VPM