page 128- 137 Flashcards by Ch Mora

floor of mouth

ant 2/3 tongue

land lingual ging.

ling. nerve supply

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Lingual NErve

deep to ——(antermedial to —- —- nerve)

runs b/n —– pterygoid and ——- ramus

to enter side of tongue——–

continues forward b/n hyoglossus and deep part of —— gland

——–. ganglion hangs from ling nerve(top of —— m)

it runs across Submand duct to —- ——

deep to lat pterygoid(antermedial to in alv nerve)

runs b/n medial pterygoid and mandibular ramus

to enter side of tongue obliquely

continues forward b/n hyoglossus and deep part of aubmandibular gland

Submand. ganglion hangs from ling nerve(top of hyoglossus m)

it runs across Submand duct to tongue tip

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chorda tympani contributes

pregang PS fibers to submand ganglion

taste fibers of ant 2/3 tongue

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4 paired nuclie

(M and S)

trigeminal nuclei

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motor nucleus

lateral pons

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Motor nucleus

motor info originates in —- and —— cortices

modulated by —– —— and striatal motor system

descend as ——— tracts to

——– ———of trigeminal where

LMN projects past the—— ——–(w/o synapse)

2 the respective effector muscle

motor info originates in motor (area 4) and premotor (area 6) cortices

modulated by basal ganglia and striatal motor system

descend as corticobulbar tracts to

motor nucleud of trigeminal where

LMN projects past the trigeminal ganglion(w/o synapse)

2 the respective effector muscle

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Sensory nucleus

Pons

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sensory nucleus

all sensory info from face relayed thru

—- nucleus of thalamus

From here info relays to the

——- cortex (areas3,1,2)

The —— segment of sensory homunculus comprises large area of —— ——– ——–

senspry nucleus

all sensory info from face relayed thru

VPM nucleus of thalamus

From here info relays to the

somatosensory cortex (areas3,1,2)

The facial segment of sensory homunculus comprises large area of lateral parietal lobe

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Spinal trigeminal nucleus

midpons to cervical cord

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spi. tri. nucleus

——/—— from face travel to —— ——— nucleus

(——– travel from body in the ———- tract)

Pain/ temp from face travel to spinal trigeminal nucleus

(pain/temp travel from body in the spinothalamic tract)

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mesencephalic nucleus

upper pons midbrain border

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propioceptic inputs not located with trigeminal ganglion

propioceptive inputs synapse in ——–

Mesencaphelic nucleus

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all sensory info from face relayed through VPM nucleus of thalamuc; sensory info from rest of body is through VPL

CN 5 sensory

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CN5

from the —- ——(VPM or VPL)

info relays to ——– cortex(area3,1,2)

—– segment of sensory homunculus comprises large area of lateral parietal lobe

CN5

from the thalamic nuceli(VPM or VPL)

info relays to somatosensoyr cortex(area3,1,2)

facial segment of sensory homunculus comprises large area of lateral parietal lobe

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tf parts of CN 7 and 11 travel with trigeminospinal tract

7 and 9

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all aff. cell bodies located withing trigeminal ganglion except Propioceptive inputs

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—- —- of CN5 is only case where primary sensory cell bodies located within CNS rather than ganglion

MEsencephalic nucelus

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Pain and temp

ventral trigeminothalamic tract

A and C fibers

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1 st order neurons of Pain and Temperature

trigeminal ganglion–> axons descend in spinal trigeminal tract and synapse with spinal trigeminal nucleus

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2nd order neuron of Pain and Temp

from spinal trigeminal nucleus, ascend and cross over to contralateral VPM

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3rd order neuron of pain/ temp

From VPM project via post limb of post capsule to face area of somatosensory cortex

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trigeminal ganglion (main sensory nucleus of CN5)

1st order neuron of touch and pressure

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principal sensory nucleus of CN5 project to ips VPM(doesn’t cross over)

2nd order neuron of touch and pressure

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VPM projects through post. int. capsule to face area of somatosensory cortex

Touch and pressure

(3rd order neuron)

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spinocerebellar tract

propioception a alpha fibers(stretch and tendon receptor in muscles of matication)

Propioception of CN5 1st order neuron; af. pass the -------- ganglia(nill synapse) 2nd order neuron; ----- nucelus(in CNS),------ nucleus(create reflex arc) 3rd order neurons; -------

1st order neuron; af. pass the trigeminal ganglia(nill synapse) 2nd order neuron; mes. nucelus(in CNS),motor nucleus(create reflex arc) 3rd order neurons; cerebellum

ant hlf of ext ear canal and facial surface of upper part auricle

uricultemporal nerve(V3)

post half of ext ear canal

auricular br of vagus nerve

\> auricular nerve (c2,3)

inf. auricle(a and P)

\< occipital nerve(c2,3)

cranial surface of upper auricle

corneal reflex if stim. right eye

Left Rv1 neither eye blinks Lesion L V1 bilateral blink

corneal reflex Lesion R CN7 only

left eye blinks

Lesion L Cn7

only right eye blinks

lesion of Lev. palpebrae(CN3)

ptosis(keeps eyelid open)

orb oris(cn7)

close eyelid

lesion of Cn7 for orb oris

inability to close eyelid no corneal reflex

Divison V1,2,3 of sensory

deficits along distribution (pain, temp., touch , propioception, pressure)

Motor V3 only lesion

temporalis and masseter muscle ips open bite and weakness of jaw closure pterygoid m; weakness of jaw opening deviation to ips side on opening --\> diminished loss of reflexes

corneal reflex

touch cornea with cotton cause both eyes to close

afferent V1 efferent Cn7

corneal reflex

cornea main sensory nucleus of trigeminal medial long. fasciculus main motor nucleus of facial nerve orb oris muscle cause ips.(direct) and contralat.(indirect) eye blink

jaw jerk reflex

mouth open and relaxed tap chin to get contraction mouth closure

V3 propioceptive-afferents V3- motor - efferents

jaw jerk reflex

reflex lost only with bilateral CN5 lesion

jaw jerk lesion

Cn7

Pons(origination) enter IAM pass thru facial canal exits skull thru stylomastoid 4amen course parotid gland motor br

secretomotor of facial nerve

lac gland submand gland sublingual gland

special sense of CN 7

ant 2/3 tongue floor of mouth palate

upper face recieve bilateral innervation lower face recieves unilateral innerv muscle of facial expression, post belly digastric, stylohyoid m. stapedius

main motor nucleus

sup salivatory nucleus

submand and sublingual nucleus

nucleus of solitary tract

mediates taste

orb oris

wistle pull lips against teeth protrude lips

origin; circumoral muscles, maxilla, mandible i

orb oris

insertion ; lips and skin of lips

orb oris

origin;mand oblique line

dep. anguli oris

insertion angle of mouth

dep anguli oris zyg major risorius

origin ; zyg bone

zyg major

origin - parotid and massateric fascia

risorius

frown and pull down angle of mouth

dep. anguli oris

smile pull angle of miuth up and back

zyg major

smile pull angle of mouth laterally

risorius

close eye

orb oculi

buccinator origin

alv. process of maxilla and mandible pterygomand raphae

buccinator insertion

orb oris

buccinator

hold food on occl. table tense cheek(blow, wistle)

food/ saliva fall b/n teeth and cheek

buccinator

insert to neck of stapes

stapedius

dec. vibration of stapes)dec. perception of sound)

stapedius

paralysis of buccinator

food saliva b/n teeth and cheek

paralysis of stapedius

hypercusis

lower motor neuron

- corneal reflex ips paralysis/ weakness of upper and lower face

contralateral lower face weakness only

upper motor neuron lesion

dec taste hyperacussi dec salivation on affected side

if lesion prox to \> petrosal and CT take off (LMN)

contralateral lower face weakness only

upper motor neuron lesion

with central lesion to facial motor nucleus

one still riase eyebro on affected side b/c of bilat innervation to muscles of upper face

\> petrosal nerve cell body at ---- sal. nucelus nerve arise at ----- ------ join ----- ------ nerve exits cranium via ------- ------- enter ------ -------- nerve of pterygoid canal synapse in ------ -------

cell body at sup sal. nucelus nerve arise at gen. ganglion join deep petrossal nerve exits cranium via famen lacerum enter pterygoid canal nerve of pterygoid canal synapse in pterygopalatine ganglion

compontents of \> petrosal nerve

autonomic to lac gland glands of mucus membrane of nasal cavity, pharynx, palate

compontents of \> petrosal nerve

PS preganglion synapse at gen ganglion

sympathetics of \> pet nerve

pass thru geniculate w/o synapse

taste of \> pet nerve

from palate via palatine nerve taste fibers pass through pterygopalatine ganglion travel with nerve of pterygoid canal reaches \> petrosal nerve

CN 8 course

1. located within temporal bone innervate cochlea semiciruclar canal and maculae 2. passes IAM 3. into brain stem at junction pons and medulla, fibers terminate in a. cochlea nucelus b. vestibulat nucleus complex

ext ear

--\>recieve sound wave auricle ext. aud. canal

mddle ear

tympanic cavity

3 ossicles 2 muscles

MIS stapedius, tensory tympani

upper motor nucleus recieves

upper motor neruons from both sides of motor on face