Cranial Nerves IX, X, XI, XII Flashcards Preview

Anatomy 6512 > Cranial Nerves IX, X, XI, XII > Flashcards

Flashcards in Cranial Nerves IX, X, XI, XII Deck (39)
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1

Select the correct matching pair.
A) Spinal trigeminal nucleus: Discriminative touch
B)Trigeminal motor nucleus: Muscles of facial expression
C) Facial motor nucleus: Muscles of mastication
D) Main trigeminal sensory nucleus: Pain and temperature
E) Mesencephalic nucleus: Spindles from muscles of mastication

E) Mesencephalic nucleus: Spindles from muscles of mastication

2

A patient reports a loss of pain sensation on the left side of the face after a stroke. What is the most likely location for this lesion?
A) Right main trigeminal sensory nucleus
B) Left main trigeminal sensory nucleus
C) Left facial sensory nucleus
D) Right spinal trigeminal tract/ nucleus
E) Left spinal trigeminal tract/ nucleus

E) Left spinal trigeminal tract/ nucleus

3

Same patient with loss of pain sensation on the left side of the face. What brainstem level is likely involved?
A) Left lateral, dorsal medulla
B) Left anterior, medial pons
C) Left anterior, medial medulla
D) Left lateral midbrain
E) Left anterior, medial midbrain

A) Left lateral, dorsal medulla

4

Which is a function of cranial nerve VII?
A) Innervates stylopharyngeus muscle
B) Innervates muscles of mastication
C) Mediates taste on posterior 1/3 of tongue
D) Lacrimation
E) Provides visceral motor efferent fibers to the parotid gland


D) Lacrimation

5

A patient complains of a droopy face, a dry red eye and noisy children who make her “ears hurt”. Select the true response.
A) The lesion must involve the facial sensory nucleus on the affected side because the eyes are red
B) The lesion must involve the superior salivatory nucleus, which can account for all these findings
C) It is most likely that the facial nerve is involved on the side ipsilateral to the facial weakness
D) It is most likely that the facial nerve is involved on the side contralateral to the facial weakness

C) It is most likely that the facial nerve is involved on the side ipsilateral to the facial weakness

6

What is the axon type of CN XII?

Somatic motor

7

What is the origin of CN XII?

hypoglossal nucleus

8

What is the the peripheral termination of CN XII?

tongue muscles

9

What are the results of a CN XII lesion?

(lower motor neuron) lesion:
a) Deviation toward lesion
b) Fasciculations
c) Atrophy

10

Where does CN XII exit the brainstem?

adjacent to pyramid

11

What is the origin of Hypoglossal Corticobulbar Fibers?

motor cortex

12

Where do Hypoglossal Corticobulbar Fibers decussate?

adjacent to hypoglossal nucleus

13

What is the result of a Hypoglossal Corticobulbar (upper motor neuron) lesion?

a) Deviation toward side opposite
b) No fasciculations
c) Minimal atrophy

14

Select the correct statement
A) The tongue deviates to the side of XII nerve injury when protruded
B) The tongue deviates contralateral to the side of the lesion when upper motor neurons to the hypoglossal nucleus are injured
C) Tongue atrophy may be seen when XII nerve is injured
D) Cranial nerve XII is a somatic efferent nerve
E) All of the above are true

E) All of the above are true

15

What is the axon type of CN XI?

Branchial motor

16

What is the CNS origin of CN XI?

Accessory nucleus in cervical spinal cord (caudal medulla to ~C5)

17

What is the peripheral termination of CN XI?

Sternocleidomastoid, trapezius

18

What is the Effect of Accessory Nerve Lesion on the Trapezius Muscle?

a) Scapula and clavicle hang due to weak trapezius
b) Weak shoulder shrug as levator scapulae must work alone
c) Muscle atrophy leads to scalloped appearance of neck contour

*May be damaged in lymphadenectomy surgery for treatment of head and neck cancer including cancer of the oral cavity.

19

What are the axon types for CN IX?

a) B, Branchial motor;
b) Ss, Somatic sensory;
c) Vm, Visceral motor;
d) Vs, Visceral sensory

20

What is the CNS origin or termination ganglion for CN IX Somatic sensory axons?

Spinal trigeminal nucleus
Superior ganglion of IX

21

What is the Peripheral origin or termination of CN IX somatic sensory axons?

Skin of outer ear

22

What is the CNS origin or termination ganglion for CN IX visceral sensory axons?

Nucleus of solitary tract
Inferior ganglion of IX

* or from Nucleus of solitary tract, (spinal trigeminal nucleus)
Inferior ganglion of IX

23

What is the Peripheral origin or termination of CN IX visceral sensory axons?

Taste buds posterior 1/3 tongue, carotid body & sinus

*or Mucosa posterior 1/3 tongue, pharynx and middle ear

24

What is the Peripheral origin or termination of CN IX visceral motor axons?

Parotid gland

25

What is the CNS origin or termination ganglion for CN IX visceral motor axons?

Inferior salivatory nucleus
Otic ganglion

26

What is the CNS origin or termination ganglion for CN IX branchial motor axons?

Nucleus ambiguus

27

What is the Peripheral origin or termination of CN IX branchial motor axons?

Pharynx (stylopharyngeus)

28

IX Afferents

Skin of ear & middle ear
a) Superior ganglion of IX nerve
b) Trigeminal spinal nucleus
Posterior ⅓ of tongue
a) Superior ganglion of glossopharyngeal nerve
b) Trigeminal spinal nucleus

Carotid body: Blood O2, CO2 & pH
Carotid sinus: Changes in blood pressure
Inferior ganglion of glossopharyngeal nerve
Solitary nucleus


29

IX Efferents

- Nucleus ambiguus
a) Stylopharyngeus muscle (elevates pharynx in speech & swallowing)
b) Other pharyngeal and laryngeal muscles
c) Inferior salivatory nucleus
d) Otic ganglion - Parotid salivary gland

30

Glossopharyngeal Neuralgia

- Similar to trigeminal neuralgia
- Rare, but distressing
- Sudden burst of pain starts in posterior tongue or wall of pharynx, then radiates to ear
- Trigger zone on tongue/ pharynx and attacks precipitated by swallowing or talking
- Pharmacologic management or tractotomy of spinal trigeminal tract in caudal medulla