LEC54: Cranial Nerves II Flashcards Preview

Structures: Part Deux > LEC54: Cranial Nerves II > Flashcards

Flashcards in LEC54: Cranial Nerves II Deck (47):
1

function of SVE, special visceral efferent, fibers?

fibers innervating muscles derived from a branchial arch

2

function of SVA, special visceral afferent, fibers?

fibers that deal w/ GUT-RELATED SENSE of head/neck:

1) taste

2) smell

3

function of SSA, special somatic afferent, fibers?

NON-GUT related to special SENSE fibers of head/neck:

1) vision

2) balance

3) hearing

4

what kinds of nerve fibers present in head/neck?

both special and general just b/c in head/neck, doesn't mean it's ONLY special fibers- also have general

5

which CN are special sensory nerves?

1) CNI: olfactory

2) CNII: optic

3) CNVII: vestibulocochlear

6

what is unique about CNI, CNII?

CNI, olfactory & CNII, optic ARE NOT REALLY NERVES;

nerve must come from a nucleus, go to effector organ, or have sensory ganglia somewhere;

these are actually BRAIN TRACTS

7

fiber type in CNI, olfactory n? fxn?

SVA ONLY

helps w/ flavor detection by bringing in air

8

fiber type of CNII, optic n? fxn?

SSA ONLY

nerve of vision

transmits info from retina > brain

9

function and significance of central artery of the retina?

an END ARTERY w/ NO collaterals

when lose this, lose vision

10

fiber type of CNVII, vestibulocochlear n? fxn?

SSA only

balance!

vestibular and auditory systems

11

which CN are myotomal?

1) CNIII, oculomotor

2) CNIV, trochlear

3) CNVI, abducens

4) CNXII, hypoglossal

12

derivation of myotomal CNs?

somites

13

what fiber type for all myotomal CN?

GSE

14

fiber types/fxn of CNIII, occulomotor?

GSE & GVE-autonomics

15

what do autonomics of CNIII do?

preganglionic parasympathetics, do pupillary constriction

16

location of CNVI, abducens? susceptibility therein?

lies on clivus bone

v susceptible to pontine tumors

17

which CN is big motor nerve of tongue?

CNXII, hypoglossal

18

which CN are branchioneric?

1) CNV: trigeminal

2) CNVII: facial

3) CNIX: glossopharyngeal

4) CNX: vagus

5) CNXI: spinal accessory n

branchioneric = derived from branchial arches, so have to do w/ neural crest cells

19

muscle type related to branchioneric nerves?

skeletal

20

what is most widespread nerve in the head?

CNV, trigeminal

21

fiber types for CNV, trigeminal

SVE, GSA

(mainly GSA)

22

divisions of trigeminal n?

1) opthalmic

2) maxillary

3) mandibular

23

what controls ability to stick out tongue?

CNV, trigeminal's GSA fibers

24

what does CNV, trigeminal, innervate?

1) muscles of mastication

2) muscles of tongue

3) corneal reflex

4) facial sensory innervation

5) mucosa of inernal paranasal sinuses

25

which divisions of CNV, trigeminal n innervate which parts of face?

Q image thumb

A image thumb
26

what is trigeminal neuralgia?

aka tic douboureaux 

usu limited to 1 division of trigeminal on 1 side 

extremely painful 

27

fiber types for CNVII, facial n

1) SVE 

2) GSA - swatch near auricle 

3) SVA - taste! 

4) GVE 

28

what is chorda tympani? 

nerve that originates in taste buds in front of tongue; runs through middle ear; carries taste messages to brain 

joins CNVII (facial n) inside facial canal

therefore facial n, CNVII, carries taste

29

fiber types of CN IX, glossopharyngeal n?

1) SVE 

2) GSA 

3) SVA 

4) GVE 

5) GVA - coming back from pharynx

endodermal

*5 fiber types here - greater # found in any CN!*

30

fiber types of CN X, vagus n

1) SVE 

2) GSA 

3) SVA 

4) GVE 

5) GVA 

*5 fiber types, like CN IX!* 

31

what is cricothyroid m? what supplies it?

muscle of larynx 

CNX, vagus n supplies it

32

fiber types for CN XI, spinal accessory n? structure of CN XI?

SVE 

1) cranial root

2) spinal root

33

distribution of cranial root of CN XI, spinal accessory n? fiber type?

1) goes into CNX, vagus 

2) distributed in recurrent laryngeal n

SVE fibers

34

distribution of spinal root of CN XI, spinal accessory n? 

fiber type? 

what does it innervate?

1) goes into vagus, CN X 

2) comes out as own nerve, spinal accessory n

SVE fibers

innervates trapezius, sternocleidomastoid mm 

35

what do CN IX and CN X share? what is their relationship? 

4 brain stem nuclei

are very tight nerves

36

is there a correlation btwn nerve deafness and nerve balance features? why/why not?

no 

b/c vestibular and cochlear nerves come from diff pts on brain stem

37

major motor innervator of tongue?

CN XII, hypoglossal n

38

where does thyroid come from?

foramen cecum

39

what is secondary motor innervator of the tongue?

palatoglossas n, from CNX, XI 

40

what is anterior 2/3 of tongue covered in?

ectoderm

41

what embryonic tissue type is posterior 1/3 of tongue derived from?

endoderm

42

what provides general sensation to anterior 2/3 of tongue?

GSA from CN V

43

what provides taste for anterior 2/3 of tongue?

SVA from CN VII

chorda tympany

44

what fiber type & from which nerve provides sensory innervation to posterior 1/3 of tongue?

GVA by CN IX 

GVA not GSA since endodermally derived

45

what fiber type & from which nerve carry taste for posterior 1/3 of tongue?

SVA, CN IX, glossopharyngeal

46

which CN carries taste sensation for epiglottis?

CN X

47

what is main sensory nerve for gag reflex?

CN IX, glossopharyngeal n