CN 7-12

Question 1

Where do all general somatic sensory fibers synapse?

Answer 1

Trigeminal complex

Question 2

Where are preganglionic parasympathetic fibers?

Answer 2

Facial, glossopharyngeal, and vagus nerve

Question 3

Where are preganglionic parasympathetic somata found?

Answer 3

pontine and medullary nuclei

Question 4

What does CN 7 innervate?

Answer 4

Superficial mimetic facial muscles

Question 5

Path of somatic motor neurons of the facial nerve

Answer 5

Leave pons in facial nerve thru temporal bone and middle ear cavity, exits via stylomandibular foramen, enters the parotid gland and divides into 5 branches

Question 6

Muscles innervated by somatic motor neurons of facial nerve

Answer 6

Stapedius, stylohyoid, posterio belly of digastric, mimetic muscles

Question 7

Greater Petrosal nerve path

Answer 7

From facial nerve at geniculate ganglion, pass anteriorly across the middle cranial fossa, enter pterygopalatine fossa, synapse in pterygopalatine ganglion

Question 8

Parasympathetic greater petrosal nerve of the facial nerve innervate what?

Answer 8

Post-pterygopalatine ganglion fibers control secretion of the lacrimal gland/mucous glands of nasal cavity

Question 9

Chorda tympani nerve path

Answer 9

Leaves middle ear cavity and joins lingual nerve in the infratemporal fossa, synapse with submandibular ganglion

Question 10

Parasympathetic chorda tympani innervates what?

Answer 10

Postganglion control secretion from submandibular and sublingual salivary glands

Question 11

Visceral sensation of taste to anterior 2/3rds of tongue is supplied by what?

Answer 11

Facial via ganglia in temporal bone. Fibers join chorda tympani in middle ear cavity, pass inferiorly into the infratemporal fossa to join the lingual nerve

Question 12

Sensory to external auditory canal and ear and small area to oropharynx pathway

Answer 12

Sensory cell bodies are in geniculate ganglion

Question 13

Cranial nerve 8

Answer 13

Vestibulocochlear nerve

Question 14

Cranial nerve 9

Answer 14

Glossopharyngeal nerve

Question 15

Somatic motor neurons in CN9

Answer 15

innervate stylopharyngeus

Question 16

Parasympathetic of CN9

Answer 16

Diverge from CN9 at base of skull, enter/pass thru middle ear cavity, exit middle ear cavity as lesser petrosal nerve, synapse on otic ganglion (deep in infratemporal fossa). Postgang. Join auriculotemporal and innervate parotid

Question 17

Somatic sensation of CN9

Answer 17

Supplies limited somatic sensation to posterior tongue/oropharyns/middle ear cavity

Question 18

Taste sensation of CN9

Answer 18

Posterior 1/3 of tongue. Sensory cell bodies are in inferior ganglion near base of skull. Peripheral processes pass to posterior tongue, central processes synapse on rostral half of solitary nucleus

Question 19

General viseral sensory info of CN9

Answer 19

O2 levels and BP from carotid artery. Sensory bodies are inferior ganglion of 9, peripheral fibers distribute to/synapse on receptors in carotic body/siphon. Central processes synapse on the caudal half of the solitary nucleus

Question 20

Cranial nerve 10

Answer 20

Vagus nerve

Question 21

Somatic motor neurons of CN10

Answer 21

Nucleus ambiguus, axons innervate most of pharynx and larynx

Question 22

Parasympathetic innervation of CN10

Answer 22

Pregang cell bodies are in dorsal motor nucleus of 10 in medulla, pregang fibers pass in vagus nerve t o thorax and abdomen and synapse close to target organ

Question 23

General viseral afferents of CN10

Answer 23

Info/function status of thoracic/abdominal organs. Sensory cell bodies are in inferior ganglion of 10, peripheral processes distribute with vagus nerve, central process synapse on cells in caudal solitary nucleus

Question 24

General taste and sensation of CN10

Answer 24

Posterior tongue/adjacent pharyngeal wall. Sensory cell bodies are superior/inferior vagal ganglia, central processes synapse on cells in the trigeminal spinal nucelus/solitary nucleus

Question 25

Symptoms of vagus nerve damage

Answer 25

Low/soft voice, aspirate fluids/food more easily, asymmetrical soft palate

Question 26

Cranial nerve 11

Answer 26

Accessory nerve

Question 27

Muscles innervated by CN11

Answer 27

Trapezius and sternocleidomastoid

Question 28

Path out of the skull of CN11

Answer 28

Lateral surface of cervical cord, pass thru f. magnum into skull, leaves via jugular foramen

Question 29

Cranial nerve 12

Answer 29

Hypoglossal nerve

Question 30

Path of CN12

Answer 30

Exit thru hypoglossal canal, pass anteriorly to enter deep floor of mouth

Question 31

Innervation of CN12

Answer 31

Intrinsic/extrinsic muscles of the tongue except palatoglossus