Cranial Nerves CN VII, IX, X, XI, XII

Question 1

CN X exits at?

Answer 1

Post olivary sulcus

Question 2

Name nuclei of CN X vagus?

Answer 2

Dorsal motor nucelus
Nucleus ambiguus
Nucleus of solitary tract
Nucleus of spinal tract of trigeminal

Question 3

Where do nuclei of CN X reside?

Answer 3

Medulla

Question 4

Function of CN X?

Answer 4

Parasympathetic to thorax and abdomen.
Motor to pharyngeal constrictors, intrinsic laryngeal muscles, palatine muscles, and upper esophagus for phonation and swallowing.
Taste from larynx and epiglottis.
Sensory to pharynx, larynx, concha of external ear, and meninges of posterior fossa

Question 5

Lesion to CN X?

Answer 5

Hoarseness, dysphagia, loss of gag reflex, and uvular deviation to strong side.

Question 6

What is motor nucleus of CN X?

Answer 6

Nucelus ambiggus

Question 7

What are parasympathetic nuclei of CN X?

Answer 7

Nucelus of solitary tract and dorsal motor nucelus.

Question 8

What is sensory nucelus of CN X?

Answer 8

Nucelus of spinal tract of trigeminal

Question 9

What is taste nuclei of CN X?

Answer 9

Nucelus of solitary tract

Question 10

Origin of CN XI?

Answer 10

Nucelus ambiguus and disperse cell bodies/medulla and cervical segments

Question 11

Where does CN XI exit?

Answer 11

Post olivary sulcus

Question 12

Cranial accessory function of CN XI?

Answer 12

Joins vagus nerve to supply muscles of pharynx, larynx, and soft palate

Question 13

Spinal accessory function of CN XI?

Answer 13

Motor to SCM and traps.

Question 14

Lesion to CN XI?

Answer 14

Inability to rotate head and shrug shoulders.

Question 15

What CNs exit skull at jugular foramen?

Answer 15

IX, X, and XI

Question 16

Origin of CN XII?

Answer 16

Hypoglossal nucelus at level of medulla

Question 17

Where does CN XII exit at?

Answer 17

Pre-olivary sulcus and then hypoglossal canal

Question 18

Function of CN XII?

Answer 18

Motor to all of tongue muscles except palatoglossus

Question 19

Lesion to CN XII?

Answer 19

Ipsilateral tongue paralysis and atrophy

Question 20

Origin of CN IX?

Answer 20

Nucelus of solitary tract in medulla.
Nucelus ambiguus in medulla.
Inferior salivatory nucelus in pons.
Nucelus of spinal tract of trigeminal.

Question 21

What is the taste and autonomic nucelus of CN IX?

Answer 21

Nucelus of solitary tract in medulla

Question 22

What is motor nucelus of CN IX?

Answer 22

Nucelus ambiguus

Question 23

What is parasympathetic necleus of CN IX?

Answer 23

Inferior salivatory nucelus in pons

Question 24

Where does CN IX exit?

Answer 24

Post olivary sulcus and medulla

Question 25

Function of CN IX?

Answer 25

Motor to stylopharyngeus muscle, taste to posterior 1/3 of tongue, sensory to middle ear, tympanic cavity, Eustachian tubes, tonsils, naso-Oro-pharynx, uvula, soft palate, and posterior 1/3 tongue. Parasympathetic to parotid gland

Question 26

Via what is CN IX parasympathetic to parotid gland?

Answer 26

Otic ganglion

Question 27

What sends afferent fibers from carotid sinus/body?

Answer 27

CN IX

Question 28

Describe pathway of preganglionic parasympathetic fibers from CN IX to form tympanic nerve?

Answer 28

Nerve enters plexus and is joined by sympathetic fibers from carotid plexus (superior cervical ganglion) to then form lesser petrosal nerve which synapses in otic ganglion.

Question 29

Describe path of postganglionic fibers from otic ganglion from CN IX?

Answer 29

Enter auriculotemporal nerve (V3) to supply parotid salivary gland

Question 30

Name nuclei of CN VII?

Answer 30

Facial nucelus in lower pons at level of facial collliculus. Nucelus of solitary tract. Superior salivatory nucelus.

Question 31

What nucelus is responsible for taste and parasympathetics?

Answer 31

Nucelus of solitary tract

Question 32

What is solely a parasympathetic nucelus for CN VII?

Answer 32

Superior salivatory nucelus.

Question 33

What is the motor nucelus of CN VII?

Answer 33

Facial nucelus

Question 34

Function of CN VII motor nucelus?

Answer 34

Motor to muscles of facial expression, auricular muscles, stapedius, posterior belly of diagastric and stylohyoid muscles.

Question 35

What is the function of nucelus of solitary tract CN VII?

Answer 35

Taste from anterior 2/3 of tongue via chorda tympani

Question 36

What is function of superior salivatory nucleus CN VII?

Answer 36

Parasympathetics to lacrimal and serous and mucous glands of nasopharynx, and submandibular and sublingual salivary glands.

Question 37

What are the peripheral branches of CN VII?

Answer 37

Temporal, zygomatic, buccal, marginal mandibular, cervical

Question 38

Where does CN VII exit at?

Answer 38

Cerebellopontine angle and exits via stylomastoid foramen

Question 39

How to examine CN VII?

Answer 39

Facial expression, movements, and taste

Question 40

What happens if CN VII is lesioned?

Answer 40

Bell’s palsy LMN type facial paralysis (unilateral facial paralysis with inability to wrinkle forehead, raise eyebrow, shut eye, smile, tears over sagging lower eyelid and loss of taste anterior 2/3 tongue.