Facial nerve CN VII

Question 1

What general somatic fibers are carried by CN VII?

Answer 1

Sensory innervation of skin around external acoustic meatus, parts of auricle and retroauricular/mastoid region.

Question 2

WHat special visceral afferents does the CNVII carry?

Answer 2

Taste from the anterior 2/3 of the tongue.

Question 3

What are the general visceral efferent functions of CNVII?

Answer 3

• parasympathetic - secretomotoric.
  Innervation of the Lacrimal, submandibular and Sublingual glands as well as mucous membranes of the nasal cavity, hard and soft palates.

Question 4

What are the special visceral efferents of CNVII?

Answer 4

Brachiomotor innervation of the muscle of the facial expression and scalp.
As well as the stapedius, stylohyoid and posterior belly of the digastric muscles.

Question 5

Where does the facial nerve arise?

Answer 5

In two different roots in the CPA. -motor root and sensory root.

Question 6

Where are the neurons associated to the motor root of CNVII located?

Answer 6

In the large motor nucleus of the facial nerve, located in the pons.

Question 7

Where are the cell bodies of the sensory root of CN VII located?

Answer 7

In the geniculate ganglion.

Question 8

Where does the central process of the sensory root and motor root of CNVII terminate?

Answer 8

At the sensory nucleus of CNV and nucleus of the solitary tract respectively.

Question 9

What other name does the extracranial part of CNVII have?

Answer 9

The branchial motor portion

Question 10

Where does the CNVII exit the brain?

Answer 10

At the ventral side of the pontomedullary junction under the trochlear nerve and above the vestibulocochlear nerve.

Question 11

Where does the CNVII exit the skull and together with what nerve?

Answer 11

Through the internal acustic meatus together with the vestibulocochlear nerve.

Question 12

Another name for the sensory root of CNVII?

Answer 12

The intermediate nerve

Question 13

WHat is the intermediate nerve?

Answer 13

Its the sensory root of CNVII

Question 14

Where is the first segment of the intratemporal part of the CNVII?

Answer 14

The petrous portion

Question 15

From the petrousus part of the CNVII it gives away several important branches to the ear. Which?

Answer 15

• Geniculate ganglion
• Greater petrosal nerve
• Pterygopalatine ganglion
  *Chorda tympani
  *Submandibular ganglion
  *Nerve to stapedius

Question 16

What is the geniculate ganglion?

Answer 16

Its the ganglion for the cellbodies for the sensory components of the facial nerve.

The facial nerve takes a turn and enter through the facial canal in the cranium. The geniculate ganglion is situated at the tip/knee of the bend of this curve.

Question 17

The geniculate ganglion gives of an important nerve that transmits parasympathetic and taste axons. Which?

Answer 17

The greater petrosal nerve

Question 18

What information is transmitted by the greater petrosal nerve?

Answer 18

Taste and parasympathetics for CNVII

Question 19

How does the greater petrosal nerve go from the geniculate ganglion to its destines in the face?

Answer 19

Through the temporal bone, in the floor of the middle fossa and through foramen Lacerum.

Question 20

What structures pass through foramen lacerum?

Answer 20

*Greater petrosal nerve (from sensory CNVII)

Question 21

What is the deep pertrosal nerve that joins the greater petrosal nerve after entering foramen lacerum?

Answer 21

Its a sympathetic fibers from the internal carotid plexus.

Question 22

Except for the deep petrosal nerve, another nerve joins the greater petrosal nerve after foramen laserum. Which?

Answer 22

The Vividan nerve.

Question 23

What is the Pterygopalatine ganglion?

Question 24

What nerve does nervus infraorbitalis belong to?

Answer 24

Maxillary nerve (CNV)

Question 25

What neck-muscles are innervated by the facial nerve?

Answer 25

*Digastric m
*Platysma m
*Stylohyoid m

Question 26

What two ganglions take information about tase from chorda Tympani?

Answer 26

• Otic ganglion
• geniculate ganglion

Question 27

Through what opening in the skull does the CNVII exit the skull?

Answer 27

Stylomastoid foramen.

Question 28

What branches are hoing off after exiting the stylomastoid foramen?

Answer 28

• marginal mandibular branch of the facial nevre
• posterior auricular nevre
• Zygomatic branches of facial nerve
• Buccal branches of facial nerve
• Temporal branches of the facial nerve

Question 29

what branch of the facial nerve transmitts taste sensation?

Answer 29

Chorda tympani.

Question 30

what muscles are affected if cutting the CNVII at parotis?

Answer 30

• Orbicularis oris
• levator labii superioris alaeque nasi
• Buccinator

Question 31

Which branch of the facial nerve synapse in the pterygopalatine ganglion?

Answer 31

The greater petrosal nerve

Question 32

What nerves supply parasympathetic fubers to the facial nerve?

Answer 32

The sensory root of facial nerve and Chorda tympani

Question 33

What ganglion does the greater petrosal nerve emerge from?

Answer 33

The geniculate ganglion

Question 34

What may cause hemifacial spasm?

Answer 34

A blood vessel or mass compressing the facial nerve

Question 35

what might existens of palmomental reflex in adulthood indicate?

Answer 35

Neurodegenerative processin the frontal brain

Question 36

Geniculate and otic ganglia both take tasteinformation. From what nerve?

Answer 36

From chorda tympani (CNVII)

Question 37

There are two non-nervous structures exiting through the internal acoustic meatus. Which?

Answer 37

The labyrinthine artery and vein.

Question 38

The facial nerve enter the temporal bone via the internal acoustic meatus and then continue through the facial canal in the medial wall of the cavity, give off the geniculate ganglion and the nerve of stapedius and chorda tympani. Then exits the temporal bone via what structure?

Answer 38

The styleomastoid foramen.

Question 39

What two innervations are carried by the chorda tympani?

Answer 39

1. taste 2/3 front of tongue
2. parasymp. fibers to submandibular/sublingual glands.

Question 40

What nuclei are associated to the facial nerve?

Answer 40

• motor nucleus of the facial nerve (SVE)
• Superior salivatory nucleus (GVE)
• Nuleus of solitary tract (SVA)
• Principal sensory nucleus of trigeminal nerve (GSA)