Quiz 2

Question 1

What muscles do the oculomotor nerve supply?

Answer 1

all extraocular muscles except superior oblique and lateral rectus

Question 2

What kinds of fibers does the oculomotor nerve carry?

Answer 2

somatic and parasympathetic

Question 3

What is the nuclei of origin for the somatic part of the oculomotor nerve?

Answer 3

somatic nuclei of origin

Question 4

Where is the somatic nuclei of origin located?

Answer 4

periaqueductal gray, anterior to the cerebral aqueduct, and the level of the superior colliculus

Question 5

What part of the cerebral cortex sends axons to the oculomotor nuclei?

Answer 5

upper motor neurons in brodmann area 8

Question 6

The oculomotor nuclei receives fibers from which two places?

Answer 6

superior colliculus and medial longitudinal fasciculus

Question 7

Describe the path of the oculomotor nerve

Answer 7

1. periaqueductal grey matter
2. travels anteriorly through the Red nucleus
3. exits the CNS in the interpeduncular fossa (covered by epinerium now)
4. penetrates the dura
5. travels along the cavernous sinus
6. exits the skull through the superior orbital fissure
7. into the eye socket where it splits into superior and inferior rami

Question 8

What muscles are supplied by the superior ramus of the oculomotor nerve?

Answer 8

superior rectus and levator palpebrae superior

Question 9

What muscles are supplied by the inferior ramus of the oculomotor nerve?

Answer 9

medial rectus, inferior rectus, inferior oblique

Question 10

What kind of neurons does the accessory oculomotor nucleus contain?

Answer 10

preganglionic parasympathetic

Question 11

Where do the preganglionic parasympathetic oculomotor neurons go?

Answer 11

follow the oculomotor nerve and synapse in the ciliary ganglion

Question 12

Where is the ciliary ganglion located?

Answer 12

posterior to the eyeball about 1 cm anterior to the superior orbital fissure

Question 13

What does the ciliary ganglion contain?

Answer 13

postganglionic parasympathetic axons

Question 14

What do the postganglionic parasympathetic axons follow?

Answer 14

the course of the ciliary arteries, pierce the sclera and travel along the internal surface of the sclera

Question 15

What do the postganglionic parasympathetic axons supply?

Answer 15

ciliaris and pupillary constrictor

Question 16

What else do the postganglionic parasympathetic fibers of the ciliary ganglion carry?

Answer 16

sympathetic and somatic sensory fibers

Question 17

Describe the trigeminal nerve.

Answer 17

largest cranial nerves, carries many more sensory fibers than motor fibers (great sensory nerve of the face)

Question 18

What are the 3 nuclei of termination associated with the trigeminal nerve?

Answer 18

main sensory
spinal
trigeminal mesencephalic nucleus

Question 19

What is the nucleus or origin for the trigeminal nerve?

Answer 19

trigeminal motor nucleus of the pons

Question 20

What is the name of the peripheral ganglion that is associated with the trigeminal nerve?

Answer 20

trigeminal (semilunar) ganglion

Question 21

What are the 3 branches of the trigeminal nerve?

Answer 21

opthalmic, maxillary, mandibular

Question 22

Where are the cell bodies of the main and spinal nucleus located?

Answer 22

trigeminal ganglion

Question 23

Where do the peripheral processes come from for the main and spinal nuclei?

Answer 23

face to trigeminal ganglion

Question 24

Describe the pathway for the main and spinal pathways.

Answer 24

Central processes from trigeminal ganglion enter CNS and go to the main trigeminal nuclus or to the spinal nucleus

Question 25

What kind of information does each of the nuclei carry?

Answer 25

trigeminal (touch, vibration, joint proprioception) | spinal (pain and temperature)

Question 26

What is the analogous cord pathway of the trigeminal and spinal pathway?

Answer 26

lateral spinothalamic

Question 27

Describe the pathway to the mesencephalic nucleus

Answer 27

dendrites from the periphery pass through the trigeminal ganglion, enter the CNS and ascend to the mesencephalic nucleus

Question 28

What kind of neurons for the mesencephalic nucleus?

Answer 28

primary sensory neurons that have cell bodies located in the CNS

Question 29

Describe the pathway for the motor nucleus of the trigeminal nerve.

Answer 29

axons from the motor nucleus leave the CNS and travel through the trigeminal ganglion to be carried in the mandibular branch to supply

Question 30

Which branch of the trigeminal nerve is the only one to carry motor fibers?

Answer 30

mandibular branch

Question 31

Where does the motor nucleus receive information from?

Answer 31

cerebral cortex, reticular formation, tectum, medial longitudinal fasciculus, mesencephalic nucleus

Question 32

What is the apparent origin of the trigeminal nerve?

Answer 32

lateral aspect of the pons

Question 33

What is the course of the trigeminal nerve?

Answer 33

1. nerve travels anteriorward over the petrous part of the temporal bone 2. enters a pouch of dura (Meckel's cave) where the trigeminal ganglion is found

Question 34

Where does the opthalmic division of the trigeminal nerve enter the skull?

Answer 34

superior orbital fissure

Question 35

What kind of information does the opthalmic division of the trigeminal nerve take?

Answer 35

sensory only

Question 36

What does the opthalmic division carry specifically?

Answer 36

sensation from skin over nose, forehead and scalp mucous membranes in frontal and sphenoid sinuses membrane covering nasal septum

Question 37

What do the four branches of the opthalmic division of the trigeminal nerve divide into?

Answer 37

meningeal, lacrimal, frontal, nasociliary

Question 38

What does the meningeal nerve supply?

Answer 38

dura mater lining middle cranial fossa

Question 39

When is the meningeal nerve given off?

Answer 39

before the opthalmic division leaves the superior orbital fissure

Question 40

What does the lacrimal nerve supply?

Answer 40

lacrimal gland and skin of the upper eyelid

Question 41

Where does the lacrimal nerve travel?

Answer 41

superior aspect of the lateral rectus muscle

Question 42

What does the lacrimal nerve also carry?

Answer 42

parasympathetic (secretory) fibers to the lacrimal gland

Question 43

Where do the parasympathetic fibers of the lacrimal gland originate?

Answer 43

pterygopalatine ganglion

Question 44

How does the lacrimal nerve reach the pterygopalatine ganglion?

Answer 44

zygomatic nerve and zygomaticotemporal nerve

Question 45

What does the frontal nerve divide into?

Answer 45

supratrochlear, supraorbital

Question 46

What does the supratrochlear nerve convey?

Answer 46

sensation from the medial corner of the eye

Question 47

What does the supraorbital nerve convey?

Answer 47

sensation from conjunctiva, upper eyelid and forehead | mucous membrane lining the frontal sinus

Question 48

What are the branches of the nasociliary nerve?

Answer 48

communicating branches, long ciliary, posterior ethmoid, intratrochlear

Question 49

Where does the communicating branch go?

Answer 49

to the ciliary ganglion

Question 50

What does the long ciliary nerve supply?

Answer 50

eyeball

Question 51

What does the posterior ethmoid nerve convey?

Answer 51

sensory information from the sphenoidal and ethmoidal sinuses

Question 52

What nerves does the anterior ethmoid nerve give off?

Answer 52

external and internal nasal nerve

Question 53

What does the external nasal nerve supply?

Answer 53

skin over the nose

Question 54

What does the internal nasal nerve supply?

Answer 54

mucous membrane covering the anterior part of the nasal septum

Question 55

What does the infratrochlear nerve supply?

Answer 55

medial corner of the eye, including the lacrimal sac