Cranial Nerves (VII-XII)

Question 1

Functions of Facial Nerve

Answer 1

Motor SVE - muscles of face (facial
expression) and scalp, stapedius muscle, posterior belly of digastric, stylohyoid muscles

Sensory SVA - taste from anterior 2/3 of tongue from floor of mouth and palate

Sensory GSA - sensation from a small region near the external auditory meatus

Parasympathetic GVE - secretomotor to submandibular and sublingual glands, lacrimal glands and glands of nose and
palate

Question 2

Carries brachial motor fibers for facial expression

Answer 2

Main Trunk

Question 3

In facial nerve, Carries fibers for PSY (tearing and salivation), taste, and GSA

Answer 3

Nervus Intermedius

Question 4

3 nuclei of facial nerve

Answer 4

1. Main Motor Nucleus
2. Parasympathetic Nuclei
   ● Superior salivatory nucleus
   ● Lacrimal nucleus
3. Sensory Nucleus
   ● Nucleus tractus solitarius
   ● Trigeminal nucleus

Question 5

Facial nucleus

Lies deep in the reticular formation of the
lower part of the pons

Part of the nucleus supplies muscles of the
upper part of the face receives fibers from
both cerebral hemispheres

Answer 5

Main Motor Nucleus

Question 6

Motor cortex supplying lower part of face

Answer 6

contralateral side of motor
cortex

Question 7

Motor cortex supplying upper part of face

Answer 7

both sides of motor cortex

Question 8

facial nuclei that Lie posterolateral to the main motor nucleus

Answer 8

parasympathetic nuclei

Question 9

Parasympathetic nucleus of facial nerve that receives afferent fibers from thalamus through descending autonomic pathways

Answer 9

Superior Salivatory Nucleus

Question 10

PSY facial nuclei that Receives afferent fibers from hypothalamus
for emotional responses and from sensory
nuclei of trigeminal nerve for reflex
lacrimation due to irritation

Answer 10

Lacrimal Nucleus

Question 11

has Afferent fibers: geniculate ganglion of CN VII

Efferent fibers cross midline and ascend to VPM of opposite thalamus

Answer 11

Nucleus of Tractus Solitarius

Question 12

Upper part (rostral) of nucleus of tractus solitarius

Answer 12

sensory nuclei

Question 13

● formed of Central processes of unipolar cells of
geniculat ganglion
● Also contain efferent preganglionic PSY
fibers from parasympathetic nuclei

Answer 13

Sensory Root (nervus intermedius)

Question 14

lies in the genu and
contains primary sensory neurons for taste in anterior ⅔ of tongue, GSA for a region
near external auditory meatus

Answer 14

Geniculate ganglion

Question 15

Main portion of facial nerve exits the skull through

Answer 15

stylomastoid foramen

Question 16

facial nerve Pass through the parotid gland and divides
to 5 major brachial motor branches that control facial expression

Answer 16

○ Temporal
○ Zygomatic
○ Buccal
○ Mandibular
○ Cervical
○ Other smaller motor branches
innervate the stapedius, occipitalis,
posterior belly of digastric, and
stylohyoid muscles

Question 17

Dampen movements of middle ear
ossiclesproviding feedback
modulation of acoustic signal
intensity

Answer 17

stapedius

Question 18

tensor tympani innervated by

Answer 18

trigeminal

Question 19

carried by greater
petrosal nerve (takes off the main trunk of CN VII) to reach sphenopalatine
(pterygopalatine) ganglion where
postganglionic PSY project to lacrimal
glands and nasal mucosa

Answer 19

Preganglionic PSY fibers from Superior
Salivatory Nucleus

Question 20

leaves CN VII just before
the stylomastoid foramen and travels back
upward to traverse the middle ear cavity
before exiting the skull at the petrotympanic
fissure, just medial to the TMJ.

Answer 20

Chorda tympani

Question 21

Chorda tympani carry

Answer 21

SVA taste for anterior
⅔ of tongue

Question 22

taste from
posterior ⅓ tongue and
pharynx

Answer 22

CN IX and X

Question 23

Chorda tympani Synapse with rostral

Answer 23

nucleus
solitarius (gustatory nucleus)

Question 24

Ascending projections of chorda tympani travel via
____ to VPM then
to cortical gustatory area

Answer 24

central tegmental tract

Question 25

inferior margin of the postcentral gyrus adjacent to tongue somatosensory area and extends into the fronto-parietal operculum and insula

Answer 25

BA 43

Question 26

submandibular and sublingual glands, nasal, and palatine glands

Answer 26

Superior salivatory nucleus

Question 27

UMN LESION VS LMN LESION

Answer 27

UMN lesion - contralateral side EXCEPT FOREHEAD LMN lesion - affects whole face

Question 28

2 components and function of vestibulocochlear nerve (CN VIII)

Answer 28

Vestibular: SSA - from utricle and saccule and semicircular canals - position and movement of head Cochlear: SSA - organ of Corti - hearing

Question 29

respo for head position and head movement

Answer 29

● Utricle and saccule - head position ● Semicircular canals - head movement

Question 30

Vestibular Nucler Complex ● 4 Nuclei - Beneath floor of 4th ventricle

Answer 30

1. Lateral vestibular nucleus 2. Superior vestibular nucleus 3. Medial vestibular nucleus 4. Inferior vestibular nucleus

Question 31

The nerve fibers of the vestibular nerve are the central processes of nerve cells located in the

Answer 31

ganglion, situated in internal acoustic meatus

Question 32

The vestibular nuclei receive afferent fibers from the utricle and saccule and the semicircular canals through the vestibular nerve and fibers from the cerebellum through

Answer 32

inferior cerebellar peduncle

Question 33

Efferent fibers from the nuclei pass to the cerebellum through the

Answer 33

inferior cerebellar peduncle.

Question 34

The cochlear nerve conducts nerve impulses concerned with sound from the

Answer 34

organ of corti in the cohclea

Question 35

The fibers of the cochlear nerve are the central processes of nerve cells located in the

Answer 35

spiral ganglion of cochlea

Question 36

On entering the pons, the nerve fibers of cochlear nerve divide, with two branches entering the

Answer 36

posterior and anterior cochlear nucleus, respectively

Question 37

Send axons that run medially through pons to end in

Answer 37

trapezoid body and the olivary nucleus

Question 38

cochlear nuclei ascend through post parts of of pons and midbrain as

Answer 38

lateral lemniscus

Question 39

As these cochlear fibers ascend, some of them relay in small groups of nerve cells, collectively known as the

Answer 39

nucleus of the lateral lemniscus

Question 40

he primary auditory cortex (areas 41 and 42) includes what gyrus

Answer 40

gyrus of Heschl on the upper surface of the superior temporal gyrus

Question 41

gyrus of Heschl in what cortex

Answer 41

primary auditory cortex

Question 43

The recognition and interpretation of sounds, on the basis of past experience, take place in the

Answer 43

secondary auditory area

Question 44

components and functions of glossopharyngeal nerve (CN IX)

Answer 44

● SVE- stylopharyngeus muscle- swallowing ● GVE- secretomotor PSY to parotid gland ● SVA- taste from posterior ⅓ of tongue and pharynx ● GVA- carotid sinus (baroreceptor) and carotid body (chemoreceptor) ● GSA- general sensation to middle ear, region near external auditory meatus, pharynx, and posterior ⅓ of tongue

Question 45

Parasympathetic nucleus of CN IX

Answer 45

inferior salivary nucleus

Question 45

component, muscle, and nucleus responsible of elevating the pharynx when talking or swallowing and contributes to gag reflex

Answer 45

SVE - brachial motor portion stylopharyngeus nucleus ambiguus

Question 46

PSY vagal leave via _____ and then joins the lesser petrosal nerve to synapse in the optic ganglion to the parotid gland

Answer 46

tympanic nerve

Question 47

three nucleus of glossophargyngeal nerve

Answer 47

(1) the main motor nucleus, (2) the parasympathetic nucleus - inferior salivatory nucleus (3) the sensory nucleus - nucleus solitarius

Question 48

GVA and SVA in CN IX

Answer 48

inferior (petrosal) glossopharyngeal ganglion

Question 49

GSA in IX

Answer 49

to inferior and superior (jugular) glossopharyngeal ganglion

Question 50

main motor nucleus of CN IX Lies deep in reticular formation of medulla and is formed by

Answer 50

sup end of nucleus ambiguus

Question 51

supplies stylopharyngeus muscle

Answer 51

main motor nucleus

Question 52

reflex involving the glossopharyngeal and vagus nerves helps assist regulation of blood pressure

Answer 52

carotid sinus reflex