Lecture 21

Question 1

State the 4 pairs of cranial nerves that carry parasympathetic information

Answer 1

Facial (VII)
Glossopharyngeal (IX)
Oculomotor (III)
Vagus (X)

“(FGOV = Federal GOVernment)”

Question 2

The oculomotor nerve carries which 2 modalities?

Answer 2

GSM (general somatic motor) and GVM (general visceral motor)

Question 3

Which 4 extrinsic eye muscles does the oculomotor nerve innervate? name the other muscle associated with they eye that it innervates

Answer 3

Superior rectus
Inferior rectus
Medial rectus
Inferior oblique

“(SIMI mnemonic)”

Levator palpebrae superioris

Question 4

What nerve begins at the Edinger-Westphal nucleus?

Answer 4

Oculomotor nerve

Question 5

State the 2 muscles that are supplied by the postganglionics of the oculomotor nerve

Answer 5

Constrictor pupillae (control the shape of the pupil)

Ciliary muscles (control the shape of the lens)

Question 6

What nerve innervates the superior oblique muscle of the eye?

Answer 6

the Trochlear nerve

Question 7

State the 3 branches of the Trigeminal nerve

Answer 7

Ophthalmic (V1)
Maxillary (V2)
Mandibular (V3)

“(OMM mnemonic)”

Question 8

What branch of the trigeminal nerve supplies sensation to the nose and skin above eye/upper eyelid?

Answer 8

Ophthalmic branch of the Trigeminal nerve

(does NOT supply sensation to the lower eyelid

Question 9

Explain the controversy surrounding whether or not the trigeminal nerve is a parasympathetic nerve or not.

Answer 9

Since the Trigeminal nerve and some branches of the facial nerve run together, the trigeminal nerve is sometimes mistakenly called a parasympathetic nerve

Question 10

Which is the largest of the 12 CNs? Describe the sensory and motor functions of the this CN.

Answer 10

Trigeminal nerve

Supplies the sensory innervation to the face and tongue (NOT motor or taste innervation, just sensory)

Supplies the motor innervation to the muscles of mastication

Question 11

What are the 2 nerves that supply the taste sensation of the tongue? Which of these 2 provides the motor innervation of the tongue?

Answer 11

Posterior 3rd: Glossopharyngeal Nerve

Anterior 2/3rds: Facial Nerve

The Glossopharyngeal Nerve provides innervation for the motor functions of the tongue

Question 12

State the 2 CNs that provide the sensory innervation of the eardrum. Which of these also provides sensory sensation to the oral/nasal cavities?

Answer 12

Internal surface of Eardrum: Glossopharyngeal Nerve

External surface of the Eardrum: Trigeminal Nerve (some help from Facial Nerve)

The Trigeminal Nerve provides the sensory innervation of the oral/nasal cavities

Question 13

State the 2 nerves that provide the innervation of the digastric muscle and be sure to state which belly of the muscle they innervate.

Answer 13

Anterior belly of Digastric M.: Trigeminal nerve (both the anterior belly and CN V come from pharyngeal arch 1)

Posterior belly of Digastric M.: Facial nerve (both the posterior belly and CN VII come from pharyngeal arch 2)

Question 14

The Facial nerve carries ____ fibers as part of the Parasympathetic system.

Answer 14

GVM (general visceral motor)

Question 15

State the 5 motor branches of the Facial CN that supply the mimetic muscles

Answer 15

Temporal (NOT Temporalis)

Zygomatic

Buccal

Mandibular

Cervical

“(The Zoo Brings Many Children)”

Question 16

In terms of the SVS functions of the Facial nerve, state where the following are found

Cell bodies of primary sensory neurons:

Secondary neurons origin:

Tertiary neurons End:

Answer 16

Cell bodies of primary sensory neurons: Geniculate Ganglion

Secondary neurons origin: Solitary Nucleus

Tertiary neurons End: Thalamus

Question 17

True or False:

There is a neural pathway between the Solitary nucleus and the Inferior Salivatory nucleus. explain.

Answer 17

False

There is a neural pathway between the Solitary nucleus and the SUPERIOR Salivatory nucleus

NOT a neural pathway between the Solitary nucleus and the Inferior Salivatory nucleus

Question 18

State where the GVM cell bodies of the preganglionic and postganglionic neurons of the Facial nerve can be found.

Answer 18

GVM Preganglionic neurons of Facial nerve: Superior Salivary nucleus and Lacrimal nucleus

GVM Postganglionic neurons of Facial nerve: Submandibular (sublingual) and pterygopalatine ganglia

Question 19

In terms of the path of the chorda tympani , state the nerve it branches from in the petrous portion of the temporal bone
Then state the nerve it joins after running along the eardrum.

Answer 19

nerve it branches from in the petrous portion of the temporal bone = Facial nerve

nerve it joins after running along the eardrum = Trigeminal nerve

Question 20

The cell bodies of the motor neurons of what CN are found in the nucleus ambiguous? what muscle do these supply?

Answer 20

cell bodies of the motor neurons of: Glossopharyngeal Nerve

Stylopharyngeus muscle

Question 21

Describe the path of the GVM neurons that supply the parotid gland. Which CN is responsible for this?

Preganglionic neurons:

Postganglionic neurons:

Answer 21

Preganglionic neurons: Inferior Salivatory nucleus

Postganglionic neurons: Otic Ganglion

These are all a branch from the Glossopharyngeal nerve

Question 22

Which CN carries sensation from the carotid body and carotid sinus?

Answer 22

Glossopharyngeal nerve

Question 23

What CN has the following sensory functions?

Posterior 3rd of the tongue
External Ear
Middle Ear Cavity

Answer 23

Glossopharyngeal nerve

Question 24

Which CN is the major parasympathetic nerve to the thoracic and abdominal organs? Describe the motor role this CN plays.

Answer 24

Vagus Nerve

provides motor innervation to muscles of the 4th and 5th pharyngeal arches (the pharynx and larynx muscles that are used to swallow/speak)

Question 25

In terms of the Vagus nerves GVM role, where are the cell bodies of the postganglionic neurons located?

Answer 25

Myenteric plexus within the wall of the gut tube