16: Sensory CN's

Question 1

name the sensory cranial nerves

Answer 1

I, II, V, VII, VIII, IX, X

Question 2

neural tube gives rise to

Answer 2

CNS

Question 3

neural crest will give rise to

Answer 3

all neurons whose cell bodies are located outside the CNS in the PNS-of nerves gangla and pexuses

Question 4

derivatives of the neural tube include

Answer 4

neurons in the CSN
suporting cells of the cns
somatomotor neurons of the PNS
presynaptive autonomic neurons of the PNS

Question 5

derivatives of the neural crest include

Answer 5

sensory neurons in the PNS
postsynaptice autonomic fibers
schwann neurolemma cells
adrenal medulla
head mesnchyme
melanocytes
arachnoid and pia mater

Question 6

sensory nuclei in the neural tube are restricted to

Answer 6

dorsal to the sulcus limitans

Question 7

motor nuclei in the alar plate are restricted to

Answer 7

ventral to the sulcus limitans

Question 8

in the floor of the rhomboid fourth ventricle….sulcus limitans is

Answer 8

outer margin

Question 9

name the three sensory nuclei of CN V

Answer 9

Chief sensory
Spinal
Mesencephalic

Question 10

chief sensory located in the

Answer 10

pons-discreet sensory nucleus

Question 11

mesencephalic nucleus located in the

Answer 11

mesencephalon-discrete sensory nucleus

Question 12

spinal nucleus extends as a column from the _____ to the ______ where it_____

Answer 12

mesencephalon

to the spinal cord

where it is continuour with the substantia gelatinosa layers I and II

Question 13

cranial nerves projecting to spinal nucleus of CN V that is continuour with substantia gelatinosa

Answer 13

V, VII, IX, X

Question 14

VIII nuclei in the pons

Answer 14

vestibular (body positionaing) and chochlear (hearing)

Question 15

rostral solitary nucleus concerned with

Answer 15

taste->

Question 16

CN’s carrying taste info to solitary nucleus

Answer 16

CN VII. IX, X

Question 17

caudal solitary nucleus concerned with

Answer 17

cardiorespiratory inputs

Question 18

taste to anterior 2/3 of the tongue

Answer 18

nervous intermedius- CN VII

Question 19

taste from posterior 1/3 of tongue

Answer 19

CN IX

Question 20

trace path of smell into cortex

Answer 20

nasal epithelia sensory receptors-thin axons arise thru CRIBRIFORM plate–> synapse in bulb–> axons thru olfactory tract-synapse in 1. olf cortex, amygdala, other forebrain parts

Question 21

lack of smell

Answer 21

anosmia

Question 22

receptors for CN II located

Answer 22

in the retina at the posterior of the eye

Question 23

optice nerve made up of….

Answer 23

axons of retinal ganglion cells

Question 24

trace visual stimulus to cortex

Answer 24

ligh-retina-optic nerve-chiasm-tracts-Lateral geniculate Nucleus in mesencephalon (visual thalamus)–> projectes to primary visual cortex

Question 25

primary visual cortex found ...

Answer 25

on the banks of the calcarine fissure

Question 26

some optice fibers bypass LGN and travel in the

Answer 26

brachium (arm) of superior colliculus-synapse on superior colliculus (tectum of mesencephalon)

Question 27

tectum of mesencephalon=

Answer 27

superior colliculus

Question 28

sensory branches ot CN V-accomplished somestheses for the face

Answer 28

v1-opthalmic V2- maxillary V3-mandibular

Question 29

CN V nucleus-located in rostral pons-epiciritic afferents for fine touch and vibration from face

Answer 29

chief sensory

Question 30

analogous to the posterior column nuclei for face

Answer 30

chief nucleus of V

Question 31

epicritic afferents in V have their cell bodies in_____ which is located ______ *analogous to DRG of spinal cord

Answer 31

treigeminal ganglion aka gasserian ganglion located OUTSIDE THE brain stem

Question 32

cell bodies of proprioceptice afferents (spindle organs, golgi tendons organs) from masticatory muscles and extraoccular muscles

Answer 32

mesencephalic nucleus the peripheral proceses of which constitute the mescephalic tract of V

Question 33

comparable to the myotatic reflec in limbs

Answer 33

mesencephalic tracts

Question 34

pain and temp fropm face in CN V distribution

Answer 34

spinal nucleus of V

Question 35

extends from mesencephalon-to substantia gelatinosa

Answer 35

Spinal tract of V also pain and temp from VII, IX, X

Question 36

sensory tracts with Cell Bodies in Trigeminal Ganglion

Answer 36

SPinal and Cheif

Question 37

Cell bodies outside the Trigeminal ganglion

Answer 37

mesencphallic

Question 38

from chief sensory nucleus of V....

Answer 38

trigeminal lemnisucus takes fibers to contralateral side--> to the Ventral Posteromedial nucleis of the thalamus *analogous to medial lemnisiscus pathway

Question 39

trigeminothalamic tract runs from

Answer 39

spinal nucleus of V to the VPM-analogous to spinothalamic tract

Question 40

list the orientation of sensory fibers in the nucleus or travelling in the tract

Answer 40

anterior/ventral to dorsal/posteriorV1, V2, V3, | then 7. 9 , 10 are most dorsal

Question 41

proprioceptive afferents from muscles of mastication, tongue and EOM's project bylaterally to

Answer 41

TrMNu to mediate monosynaptic stretch reflexes

Question 42

CN VII has two sensory components

Answer 42

>SVA fro anterior 2/3 of tongue | >GSA (somesthetic) around external Auditory Meatus (fine touch vibration and pain/temp)

Question 43

cell bodies for somesthetic afferents of 7 located in

Answer 43

geniculate ganglion

Question 44

central processes from geniculate gangl;ion of 7 project to

Answer 44

chief sensory nucleus-- trigminal lemniscus--> VMP to thalamus--> cortex or spinal nucleus of V for pain and temperature

Question 45

taste fibers of 7 project to

Answer 45

rostral nucleus tractus solitarius | (gustatory nucleus)--. then to VPM-->then to cortex

Question 46

gustatory nucleus recieves info from CN's

Answer 46

7, 9, 10

Question 47

CN VII nuclei (2)

Answer 47

vestibular | cochlear

Question 48

vestibular concerned with

Answer 48

balance and acceleration

Question 49

cochlear nucleus concerned with

Answer 49

auditory cues and hearing

Question 50

auditory receptors, also known as ______ are located in _____ * transduce airborne pressure into waves carried in 8 * tonotropic organization-lacation determines the frequency they can hear

Answer 50

hair cells in the cochlea=organ of corti

Question 51

vestibular receptors are also called ______ and are located in____

Answer 51

hair cells saccule, utricle and three semicircular canals

Question 52

cell bodies of auditory CN VIII lie in____ and send axons in CN VIII to synapse on dorsal and ventral____

Answer 52

spiral ganglion cochlear nuclei via cochlear division of vestibulocochlear nerve

Question 53

from ventral and dorsal cochlear nuclei...describe the assenction of sound info

Answer 53

synapse in D and V cochlear ganglion at pontomedullary junction-ascend BILATERALLY to inferior colliculus--> projects to medial geniculate body (auditory thalamus--> Med Gen-to auditory cortex-heschel's gyrus.

Question 54

vestibular branch of VIII--> vestibular hair cells synapse on

Answer 54

vestibular ganglion (scarpa's ganglion) in pons/rostral medulla--> send axons in vestibular division of CN VIII

Question 55

functions of CN IX

Answer 55

>taste from posterior 1/3 of tongue >somatic sensation from pharynx >chemo and baroreception from carotid sinus and carotid bodies >fine touch, pain, temperature from middle ear and part of external ear

Question 56

CN IX baroreceptors

Answer 56

from carotid sinus

Question 57

chemoreceptors CN IX

Answer 57

from carotid body

Question 58

pain and epicritic from IX ends up with

Answer 58

spinal trigem cheif of v

Question 59

chemo (body) and baro (sinus) travel with 9 to

Answer 59

caudal NTS

Question 60

afferents for general visceral sense of pharynx and larynx project to

Answer 60

caudal NTS *unique

Question 61

gag reflex

Answer 61

afferents via 9 to caudal NTS--> interneuron to Nucleus ambiguus--> efferent is vagus motoneurons to rais palate