Cranial nerves 7

Question 1

fibers of CN 7 make up how many roots?

Answer 1

2 roots

Question 2

What are the 2 roots of CN 7?

Answer 2

1) facian nerve proper

2) Nervus intermedius

Question 3

What does the facial nerve proper of CN 7 contain?

Answer 3

SVE and sensory fibers

Question 4

what does the Nervus Intermedius of CN 7 contain?

Answer 4

GVE and sensory fibers

Question 5

which root of cranial nerve 7 contains general visceral efferent fibers?

Answer 5

Nervus intermedius

Question 6

SVE of cranial nerve 7

Answer 6

Muscles of facial expression (from facial motor nucleus)

Question 7

GVE CBO of cranial nerve 7

Answer 7

Superior salivatory nucleus

Question 8

what are the 2 divisions of the superior salivatory nucleus?

Answer 8

Submandibular ganglion

Pterygopalatine ganglion

Question 9

GSA of the facial nerve (CN VII)

Answer 9

Skin of ear

Question 10

SVA of cranial nerve VII

Answer 10

taste- to anterior 2/3 of tongue (to solitary nucleus)

Question 11

GVA of CN VII

Answer 11

Palatine tonsil & posterior nasal cavity (to solitary nucleus)

Question 12

Sensory inputs and parasympathetic outputs are carried to and from the geniculate ganglion by what?

Answer 12

the nervus intermedius

Question 13

where do the GSA fibers of CN 7 terminate? what ganglion do they pass through?

Answer 13

synapse in the geniculate ganglion (its CBO)

terminate at the Trigeminal spinal nucleus

Question 14

where do SVA fibers of the facial nerve terminate?

Answer 14

Solitary nucleus- after synapsing in the geniculate ganglion (its CBO)

Question 15

where do the GVA fibers of CN 7 terminate?

Answer 15

Solitary nucleus- after synapsing in the geniculate ganglion (its CBO)

Question 16

where do fibers of CN 7 exit the skull?

Answer 16

Stylomastiod foramen

Question 17

fibers of CN 7 pass through what structure? (a plexus is formed here)

Answer 17

Parotid gland

Question 18

branches of CN 7 after they pass thru the parotid gland innervate what?

Answer 18

1) External ear (posterior auricular)

2) facial muscles

Question 19

Parasympathetic components of the Nervus intermedius:

Answer 19

A) Superior salivatory nucleus
B) Greater petrosal nerve
C) Chorda tympani nerve

Question 20

where does the greater petrosal nerve synapse?

Answer 20

Pterygopalatine ganglion

Question 21

what ganglion is associated with the chord tympani nerve?

Answer 21

Submandibular ganglion

Question 22

What is the visceral afferent portion of the facial nerve responsible for?

Answer 22

Taste- anterior 2/3 of tongue

feeling to tonsils and posterior nasal cavity

Question 23

action of facial nerve- SVE

Answer 23

• Muscles of facial expression

- Stapedius muscle

Question 24

Action of the facial nerve- GVE

Answer 24

salivation and lacrimation

Question 25

what causes Bell's Palsy?

Answer 25

Facial nerve lesion

Question 26

why is irritation of the cornea a common symptom of Bell's Palsy?

Answer 26

CN 7 controls the closure of the eyelid and lacrimation- lesion will lead to dry eyes

Question 27

where is paresis observed in Bell's palsy

Answer 27

above & below the eye

Question 28

Bell's palsy sufferers see a reduced production of what?

Answer 28

tears and saliva

Question 29

Facial nerve paralysis

Answer 29

paralysis is complete over half the face

Question 30

T/F: both nerve components of CN 7 course thru the facial canal

Answer 30

true

Question 31

the facial nerve turns in the facial canal to form what?

Answer 31

external genu

Question 32

where is the geniculate ganglion found?

Answer 32

at the genu

Question 33

which fibers exit the facial canal before the stylomastiod foramen?

Answer 33

-Stapedial nerve -branches to pterygopalatine ganglion (greater petrosal nerve) -Chorda tympani nerve

Question 34

the chorda tympani nerve carries what types of fibers?

Answer 34

GVE to submandibular ganglion SVA from tongue

Question 35

crocodile tears:

Answer 35

Unilateral tearing seen in anticipation of, and during meals

Question 36

what causes crocodile tears?

Answer 36

para-symp fibers to submandibular gland have been re-routed to pterygopalatine ganglion

Question 37

Supranuclear lesion- symptoms

Answer 37

paralysis of muscles of facial expression below the level of the eye

Question 38

which side of the face is paralyzed during a supranuclear lesion?

Answer 38

located opposite the side of the lesion