CN IX, X, XI, XII Flashcards Preview

Anatomy > CN IX, X, XI, XII > Flashcards

Flashcards in CN IX, X, XI, XII Deck (34):
1

at what level of the brainstem would you find the hypoglossal nucleus

rosrtal medulla

2

what is the function of CN XII

tongue protrusion of the genioglossus (tongue) muscle

3

what would happen if there was a lesion in the hypoglossal (lower motor neuron) nerve

-tongue deviates ipsilaterally to lesion
-fasiculations
-atrophy

4

what is the upper motor neuron sending signals to the hypoglossal nucleus

corticobulbar fibers

5

what would happen if there was a lesion in the corticobulbar pathway (upper motor neuron) with regards to CN XII

-tongue would deviate contralaterally (cuz decussates adjacent to hypoglossal nucleus)
-no fasiculations
-no atrophy

6

CN XII is what type of nerve ?

somatic efferent (motor)

7

CN XI is what type of nerve ?

brachial motor

8

what muscles does CN XI innervate

SCM, trapezius

9

what would the effect be on the trapezius m. if there was an injury to CN XI

paralyzed trapezius causing
-scap and clavicle hang
-weak shoulder shrug
-atrophy leading to scalloped neck

10

the somatic sensory portion of CN IX recieves impulses from where ? and then synapses where ?

skin of outer ear to
-spinal trigeminal nucleus
-superior ganglion of IX

11

the visceral sensory portion of CN IX recieves impulses from where ? and then synapses where ?

post. 1/3 taste buds and mucosa, carotid body and sinus, pharynx/oropharynx and middle ear to
-nucleus of solitory tract
-inferior ganglion of IX

12

the visceral motor of CN IX has origins where, and sends efferent to ?

inferior salivatory nucleus to otic ganglion to parotid gland

13

the brachial motor of CN IX has origins where and sends efferents to ?

nucleus ambiguus to stylopharyngeus (muscle of pharynx)

14

the nucleus ambiguus deals with motor or sensory input, specifically what muscle ?

motor to stylopharyngeus

15

what CN all have sensory input on the outer ear ?

CN VII, IX, X

16

changes in blood pressure would be sensed where ?

carotid sinus

17

changes in blood O2, CO2, or pH levels would be sensed where ?

carotid body

18

what ganglia/nuclei are involved with the carotid body and carotid sinus

inferior ganglion of IX and solitary nucleus

19

what is glossopharyngeal neuralgia

sudden burst of pain starting in post. 1/3 of tongue or pharynx then spreading to ear

20

where is the trigger zone for glossopharyngeal neuralgia

tongue/pharynx

21

attacks of glossopharyngeal neuralgia are precipitated by ?

swallowing or coughing

22

somatic sensory for CN X has inputs from where, and then synapses where ?

skin of outer ear to
-spinal trigeminal nucleus
-superior ganglion of X

23

visceral sensory for CN X has inputs from where, and then synapses where ?

taste buds of epiglottis and esophagus, also pain and temp from thorax, abdominals, mucosa of larynx/pharynx
-solitary nucleus
-spinal trigeminal nucleus
-inferior ganglion of X

24

nucleus ambigus has cell bodies for what CN ?

IX, and X

25

what CN exit the skull at the jugular foramen

IX, X, and XI

26

visceral motor for CN X originates where and sends efferents where ?

dorsal motor nucleus and nucleus ambigus to
-thoracic and abdominal viscera

27

brachial motor of CN originates where and sends efferents to where ?

nucleus ambigus to
-larynx pharynx laterally
-heart and lungs medially

28

what CN are involved with the spinal trigeminal nucleus

V, IX, X

29

what CN are involved with the nucleus of the solitary tract

VII, IX, X

30

what is the afferent and efferent limb of the gag reflex

afferent - CN IX
efferent - X

31

what is the afferent and efferent limb of the tongue thrust reflex

afferent - CN V or IX
efferent - CN XII

32

what is a vasovagal syncope

loss of consciousness due to vagus triggering decrease in heart rate, blood pressure, and cererebral flow

33

what nerves are at risk of entrapment by a skull base tumor in jugular foramen syndrome

IX, X, XI, XII

34

what are some of the major symptoms of jugular foramen syndrome

-palate droops
-wasting of tongue
-oropharyngeal sensory loss,
-uvula deflects contralateral to lesion
-atrophy of SCM and trapezius