Cranial nerves 2

Question 1

what is the nervus intermedius

Answer 1

part of the facial nerve which carries sensory and parasympathetic supply

Question 2

what is the function of cranial nerve 5 mesencephalic nucleus

Answer 2

proprioception

Question 3

what is the function of the principle sensory nucleus for cranial nerve 5

Answer 3

discriminitive touch

Question 4

what is the function of the spinal nucleus of cranial nerve 5

Answer 4

pain and temperature as well as conscious sensation for the viscera supplied by 9 and 10

Question 5

what is the function of the three divisions of the trigeminal nerve

Answer 5

general somatic sensation to the face, head and associated orbital, nasal and oral cavities

Question 6

V1

Answer 6

opthalmic (sensation)

Question 7

v2

Answer 7

maxillary (sensation)

Question 8

v3

Answer 8

manidibular (motor and sensory)

Question 9

what is the sensory supply of the skin over the angle of the mandible

Answer 9

greater auricular and transverse cervical branch of the cervical plexus not the trigeminal nerve

Question 10

what is meckels cave

Answer 10

on the apex of the petrous temporal bone where the trigeminal ganglion lies in a cave of dura mater

Question 11

how does the opthalmic division reach the superior orbital fissure

Answer 11

passes anteriorly on the lateral wall of the cavernous sinus

Question 12

how does the maxillary division reach the foramen rotundum

Answer 12

passes anteriorly on the lateral wall of the cavernous sinus

Question 13

if all 3 trigeminal divisions are affected where must the lesion be

Answer 13

pons or skull base

Question 14

describe the relations of the cavernous sinus

Answer 14

sphenoid sinus (air)
internal carotid artery
V1
V2
cranial nerve 3 and 4

Question 15

if the trigeminal divisions are affected in the cavernous sinus what other cranial nerves would you expect to be affected

Answer 15

3 and 4 (occulomotor and trochlear)

Question 16

describe the course of the opthalmic nerve

Answer 16

passes throught the cavernous sinus, picks up sympathetic fibres from the carotid plexus

Question 17

what are the divisions of the opthalmic nerve

Answer 17

lacrimal nerve
frontal nerve
nasocilliary nerve

Question 18

what is the sensory supply to the forehead and upper eyelid

Answer 18

supra trochlea, supra orbital and lacrimal nerves

Question 19

what is the nerve supply of the tip of the nose

Answer 19

external nasal branch of the anterior ethmoidal branch of the nasocillary branch of the opthalmic branch of the trigeminal nerve

Question 20

what is the nerve supply of corneal sensation

Answer 20

nasocilliary

Question 21

what does shingles on the tip of the nose suggest

Answer 21

shingles may develop on the cornea

Question 22

what nerve dilates the pupil

Answer 22

sympathetics in the nasocilliary branch of V1 and then the long ciliary nerves dilate the pupil

Question 23

what is the first limb of the corneal reflex

Answer 23

V1 opthalmic

Question 24

what is the nerve supply of the skin of the upper eyelid and underlying conjunctiva

Answer 24

opthalmic V1

Question 25

what does the ethmoidal nerve supply

Answer 25

ethmoidal sinuses, lateral wall of the nasal cavity, nasal septum

Question 26

what does the lacrimal nerve carry

Answer 26

parasympathetic secretomotor fibres from the pterygopalatine ganglion to the lacrimal gland

Question 27

where does V2 end up

Answer 27

foramen rotundum and pterygopalatine fossa

Question 28

s

Answer 28

s

Question 29

what are the limbs of the corneal reflex

Answer 29

V1 and 7

Question 30

where is the marginal mandibular nerve

Answer 30

inferior to the mandible and overlies submandibular gland

Question 31

what could happen after surgery to the submandibular gland

Answer 31

damage to marginal mandibular causing paralysis of lower lip muscles so dribbling

Question 32

what foramina does cn 7 travel through

Answer 32

stylomastoid foramen and internal acoustic meatus

Question 33

what are the effects of the facial nerve injury distal to the stylomastoid foramen

Answer 33

ipsilateral facial muscle paralysis

Question 34

what are the effects of a facial nerve injury within the petrous bone

Answer 34

ipsilateral facial muscle paralysis hyperacusis taste disturbances

Question 35

frontalis and orbicularis oculi

Answer 35

temporal

Question 36

orbicularis oculi and upper lip muscles

Answer 36

zygomatic

Question 37

buccinators and lip muscles

Answer 37

buccal

Question 38

lower lip muscles

Answer 38

marginal mandibular

Question 39

platysma

Answer 39

cervical

Question 40

what nerve is at risk in forceps delivery

Answer 40

7 | mastoid process hasn't formed

Question 41

what structures travel through the internal acoustic meatus

Answer 41

7,8 labyrinthine artery

Question 42

superior salivatory nucleus (7) in the pons

Answer 42

psymp, secretomotor to lacrimal gland, nasal and oral cavities, submandibular and sublingual gland

Question 43

what muscles are supplied by the facial nerve apart from facial expression

Answer 43

stapedius, stylohyoid, post belly digastric (2nd pharyngeal arch)

Question 44

what are the limbs of the jaw jerk

Answer 44

mesencephalic nucleus of trigeminal trigeminal motor nucleus

Question 45

what arch are the muscles of mastication derived from

Answer 45

1st pharyngeal arch

Question 46

what does v3 supply apart from the muscles of mastication

Answer 46

tensor tympani in the middle ear | tensor palate, mylohyoid and ant belly of digastric

Question 47

what division is trigeminal neuralgia most often found in

Answer 47

v3

Question 48

what supplies general sensation to the tongue, floor of the mouth, lower teeth and gums and carries chorda tympani (taste, secretomotor)

Answer 48

V3

Question 49

what structures does V3 travel through

Answer 49

foramen ovale | into the infratemporal fossa