Exam Two - GSA for Cranial Nerves

Question 1

All somatosensory fibers from cranial nerves return to the sensory nuclei of the ________, regardless of the cranial nerve origin

Answer 1

trigeminal nerve

Question 2

GSA fibers of vagus carry…

Answer 2

pain, temp, and touch sensations from the posterior cranial fossa, post. ear, external auditory meatus, pharynx, and posterior and the external surface of the tympanic membrane

Question 3

GSA fibers from 9 carry…

Answer 3

general sensory info (pain, temp, touch) from the skin of external ear, internal surface of typanic membrane, walls of upper pharynx, and post 1/3 of tongue, anterior surface of epiglottis and vallecula

Question 4

Which nerve controls the muscles of facial expression and the stapedius muscle?

Answer 4

facial

Question 5

which nerve controls the activity of most of the glands of the head (except parotid)?

Answer 5

facial

Question 6

which nerve carries taste from the anterior 2/3 of tongue?

Answer 6

facial

Question 7

Where do the GSA fibers of facial nerve originate?

Answer 7

originate in pain, temp, and tactile receptors of a small area of skin near the external ear

Question 8

Where are the cell bodies located for the GSA portion of facial nerve?

Answer 8

geniculate ganglion

Question 9

where do the GSA fibers of facial nerve terminate?

Answer 9

principal and spinal trigem nuclei

Question 10

Where fo the SVE fibers of facial nerve originate?

Answer 10

facial motor nucleus in the pons

Question 11

What are the SVE fibers of facial nerve responsible for?

Answer 11

form the motor root of NC 7 that supplies the muscles of facial expression

Question 12

Where is the nucleus of facial CN located?

Answer 12

caudal pons

Question 13

The caudal pans contains the cell bodies of ______ fibers of CN7

Answer 13

SVE
(innervate muscles of facial expression and stapedius)
- contains a subnucleus for each muscle it supplies
- receives input from cortex and other CN

Question 14

direct input from the cerebral cortex to facial CN is via the ________________

Answer 14

corticobulbar tracts

Question 15

subnuclei supplying muscles from the ______ receive inputs from the corticobulbar tracts of both sides

Answer 15

upper half of the face

Question 16

subnucleir supplying muscles of the ______ receive corticobulbar inputs only from the contralateral side

Answer 16

lower half of the face

Question 17

facial CN receives input from other CN nuclei which are important in ________

Answer 17

reflexes

Question 18

facial CN receives input from other CN nuclei which are important in what reflexes

Answer 18

• input from sensory nuclei of CN 5 (sucking reflex in babies)
• inputs from the superior olivary nucleus (reduce loud noise by contracting stapedius)
• inputs from the superior colliculus ( closure of the eyelids in response to bright light or a rapidly approaching object)

Question 19

unilateral lesions of CN 7

Answer 19

• paralysis of muscles of facial expression on ipsilateral side of the face
• absence of secretions from the lacrimal gland of the ipsilateral eye
• sensitivity to loud sounds ipsilaterally
• no secretions from the sublingual and submandibular glands
• loss of taste on ant 2/3 tongue and palate
• ipsilateral absence of mucous secretions (drying) of nose)

Question 20

sensory information from craniofacial structures including oral and nasal cavity

Answer 20

GSA CN 5

Question 21

face, scalp and top of head

Answer 21

GSA CN 5

Question 22

conjunctiva, tounge, teeth, external portion of tympanic membran

Answer 22

GSA CN 5

Question 23

TMJ

Answer 23

GSA CN 5

Question 24

meninges of ant and post cranial fossa

Answer 24

GSA CN 5

Question 25

innervates muscles of mastication

Answer 25

SVE CN 5

Question 26

tensor tympani, tensor palatini, mylohyoid, ant belly diagastric

Answer 26

SVE CN 5

Question 27

What are the peripheral components of the trigem nerve?

Answer 27

- opthalmic - maxillary -mandibular - semilunar - sensory and motor roots

Question 28

central components of the trigem nuclei in brainstem

Answer 28

mesencephalic pontine (principal) spinal motor

Question 29

The cell bodies of trigeminal primary afferent neurons are in the...

Answer 29

trigeminal ganglion and mesencephalic nucleus

Question 30

the central processes of trigem ganglion neurons form the large _______ of the trigem nerve before entering the pons

Answer 30

sensory root

Question 31

second order neurons for trigem system are in the brainstem's

Answer 31

trigem sensory nucleir

Question 32

ascending branches from first order neuron (trigem) terminate in the ___________ located in the pons

Answer 32

principle sensory nucleus

Question 33

decending branches of trigem form the _______-

Answer 33

spinal tract of trigem

Question 34

the principle sensory nucleus, the trigem mesencephalic nucleus and their connections are primarily involved in...

Answer 34

tactile discrimination, proprioception, and kinesthesia from the head

Question 35

mesencephalic and principle trigem is like DCML or ALS?

Answer 35

DCMS

Question 36

spinal trigem is like DCML or ALS?

Answer 36

ALS

Question 37

mesencephalic nucleus purpose

Answer 37

proprioception and muscle stretch reflex

Question 38

pontine nucleus purpose

Answer 38

discriminative touch, vibration and proprioception

Question 39

spinal trigem purpose

Answer 39

thermal, non-discriminative tactile, nociceptive inputs

Question 40

motor trigem purpose

Answer 40

SVE and muscle stretch reflex (jaw jerk)

Question 41

the principle sensory trigem nucleus is divided into the:

Answer 41

- dorsomedial division - ventrolateral division

Question 42

second order neurons in the anterior trigeminothalamic tract relays discriminative tactile info from the _________ to the ________

Answer 42

head, VPM

Question 43

dorsomedial division

Answer 43

input from the oral cavity

Question 44

ventrolateral division

Answer 44

input from all 3 components of trigem

Question 45

neurons in the VL part of the principle sensory nucleus project to the ________ along with fibers from the _______ trigem nucleus. this combined ascending projection forms the __________

Answer 45

contralateral VPM, spinal anterior trigemino-thalamic tract

Question 46

neurons in the dorsomedial division of the principle sensory nucleus project to the _______

Answer 46

ipsilateral VPM - posterior dorsal trigemino-thalamic tract

Question 47

the afferent projections from the principal terminate _________ within the _________. oral cavity is represented _______ external facial structures represented ___________-

Answer 47

somatotopically, VPM medially laterally

Question 48

____________ project via the posterior limb of the IC to S1 in the postcentral gyrus

Answer 48

third order thalamocortical neurons

Question 49

____ have the highest peripheral innervation density, and largest representation in the postcentral gyrus

Answer 49

perioral regions

Question 50

the primary afferent neurons for the mesencephalic trigemthalamic trac are located in the...

Answer 50

trigem mesencephalic nucleus

Question 51

mesencephalic tract fibers connect to....

Answer 51

trigem motor neurons reticular formation spinal trigeminal nucleus cerebellum

Question 52

blood supply for the thalamus

Answer 52

thalamogeniculate arteries

Question 53

thalamogeniculate arteries are a branch of which artery?

Answer 53

PCA

Question 54

compromise of the thalamogeniculate arteries result in the loss of tactile sensation from the...

Answer 54

contralateral body and head

Question 55

GSA from facial?

Answer 55

small area behind ear

Question 56

GSA from glossopharyngela

Answer 56

GSA to post 1/3 tongue, skin of external ear, internal surface of tympanic membrane, external membrane

Question 57

GSA from vagus

Answer 57

skin back of ear, external acoustic meatus, external surface of tympanic membrane and pharynx

Question 58

shingles is a viral disease with ______. after a bout of chickenpox, viral DNA becomes latent in ____________.

Answer 58

dermatomal distribution, trigem ganglia and DRG cells