Exercise 9

Question 1

Are cranial nerves part of the PNS?

Answer 1

Yes

Question 2

Where do cranial nerves enter the CNS?

Answer 2

the brainstem (besides the olfactory nerve)

Question 3

Where do most. cranial nerves function?

Answer 3

the head or cervical region

Question 4

Where does the vagus nerve function?

Answer 4

innervates viscera in the thoracic and abdominal cavities

Question 5

Do cranial nerves decussate?

Answer 5

no

Question 6

Does the optic pathway (optic nerves) decussate?

Answer 6

yes

Question 7

The axons of the sensory neurons that carry the info from the temporal fields of view ____

Answer 7

decussate

Question 8

The axons of the sensory neurons that. carry the info from. the nasal fields of. view _____

Answer 8

do not decussate / remain ipsilateral

Question 9

where are sensory receptors for olfaction location?

Answer 9

nasal epithelium

Question 10

Cranial Nerve i

Answer 10

Olfactory nerve

Question 11

What all are the receptors and optic nerve responsible for?

Answer 11

visual images, providing sensory info regarding the amount of light entering the eye through the pupil which is used to. regulate the contraction of the muscles of the iris and the resulting dilation and constriction of the pupil; also sensory. info regarding whether or. not an object is in focus

Question 12

accommodation

Answer 12

changing the focal point between far and close

Question 13

Cranial Nerve II

Answer 13

Optic nerve

Question 14

Cranial nerve III

Answer 14

Oculomotor nerve

innervates superior rectus, medial rectus, inferior rectus, inferior oblique muscle, pupillary constrictor muscle of the iris, ciliary muscle and elevator muscles of. the upper eyelid

Question 15

Cranial nerve IV

Answer 15

trochlear nerve

superior oblique muscle

Question 16

Cranial nerve VI

Answer 16

abducens

lateral rectus muscle

Question 17

strabismus

Answer 17

pupils that are unintentionally oriented medially result in crossed eyes or this

Question 18

Cranial Nerve V

Answer 18

Trigeminal nerve

the sensory components of this nerve detects cutaneous stimulation of the face and the cornea and the motor components innervate the muscles of mastication

Question 19

Cranial Nerve VII

Answer 19

Facial Nerve

sensory component used for gustation or taste and the motor function is for facial expressions (Bell’s palsy)

Question 20

Cranial nerve VIII

Answer 20

vestibulocochlear nerve

vestibular branch carries sensory info from the vestibular apparatus regarding balance, equilibrium, acceleration and deceleration, and body position relative to gravity

the cochlear branch of the nerve carries the sensory info from the cochlea regarding hearing

Question 21

Cranial Nerve IX

Answer 21

Glossopharyngeal nerve

mixed nerve; carries taste info from gustatory receptors in the posterior one third of the tongue

Question 22

Cranial neve X

Answer 22

Vagus nerve

mixed nerve; carries taste info from gustatory receptors in the pharynx. and epiglottis

Question 23

Cranial nerve XI

Answer 23

Spinal accessory nerve

motor function regulates action of some of the throat muscles as well as the sternocleidomastoid and trapezius muscle; assist in movement of. the head and shoulders

sternocleidomastoid turns head to opposite side

trapezius elevates the shoulder

Question 24

Cranial nerve XII

Answer 24

hypoglossal nerve; innervates the muscles of the tongue

damage to upper motor neurons will result in deviation of the tongue contralateral to the damaged upper motor neurons; decussate in the corticobulbar tracts
*** come back to this one

Question 25

dysarthria or disarticulation

Answer 25

slurring of speech