Cranial nerves 2 Flashcards
what is the nervus intermedius
part of the facial nerve which carries sensory and parasympathetic supply
what is the function of cranial nerve 5 mesencephalic nucleus
proprioception
what is the function of the principle sensory nucleus for cranial nerve 5
discriminitive touch
what is the function of the spinal nucleus of cranial nerve 5
pain and temperature as well as conscious sensation for the viscera supplied by 9 and 10
what is the function of the three divisions of the trigeminal nerve
general somatic sensation to the face, head and associated orbital, nasal and oral cavities
V1
opthalmic (sensation)
v2
maxillary (sensation)
v3
manidibular (motor and sensory)
what is the sensory supply of the skin over the angle of the mandible
greater auricular and transverse cervical branch of the cervical plexus not the trigeminal nerve
what is meckels cave
on the apex of the petrous temporal bone where the trigeminal ganglion lies in a cave of dura mater
how does the opthalmic division reach the superior orbital fissure
passes anteriorly on the lateral wall of the cavernous sinus
how does the maxillary division reach the foramen rotundum
passes anteriorly on the lateral wall of the cavernous sinus
if all 3 trigeminal divisions are affected where must the lesion be
pons or skull base
describe the relations of the cavernous sinus
sphenoid sinus (air) internal carotid artery V1 V2 cranial nerve 3 and 4
if the trigeminal divisions are affected in the cavernous sinus what other cranial nerves would you expect to be affected
3 and 4 (occulomotor and trochlear)
describe the course of the opthalmic nerve
passes throught the cavernous sinus, picks up sympathetic fibres from the carotid plexus
what are the divisions of the opthalmic nerve
lacrimal nerve
frontal nerve
nasocilliary nerve
what is the sensory supply to the forehead and upper eyelid
supra trochlea, supra orbital and lacrimal nerves
what is the nerve supply of the tip of the nose
external nasal branch of the anterior ethmoidal branch of the nasocillary branch of the opthalmic branch of the trigeminal nerve
what is the nerve supply of corneal sensation
nasocilliary
what does shingles on the tip of the nose suggest
shingles may develop on the cornea
what nerve dilates the pupil
sympathetics in the nasocilliary branch of V1 and then the long ciliary nerves dilate the pupil
what is the first limb of the corneal reflex
V1 opthalmic
what is the nerve supply of the skin of the upper eyelid and underlying conjunctiva
opthalmic V1
what does the ethmoidal nerve supply
ethmoidal sinuses, lateral wall of the nasal cavity, nasal septum
what does the lacrimal nerve carry
parasympathetic secretomotor fibres from the pterygopalatine ganglion to the lacrimal gland
where does V2 end up
foramen rotundum and pterygopalatine fossa
s
s
what are the limbs of the corneal reflex
V1 and 7
where is the marginal mandibular nerve
inferior to the mandible and overlies submandibular gland
what could happen after surgery to the submandibular gland
damage to marginal mandibular causing paralysis of lower lip muscles so dribbling
what foramina does cn 7 travel through
stylomastoid foramen and internal acoustic meatus
what are the effects of the facial nerve injury distal to the stylomastoid foramen
ipsilateral facial muscle paralysis
what are the effects of a facial nerve injury within the petrous bone
ipsilateral facial muscle paralysis
hyperacusis
taste disturbances
frontalis and orbicularis oculi
temporal
orbicularis oculi and upper lip muscles
zygomatic
buccinators and lip muscles
buccal
lower lip muscles
marginal mandibular
platysma
cervical
what nerve is at risk in forceps delivery
7
mastoid process hasn’t formed
what structures travel through the internal acoustic meatus
7,8 labyrinthine artery
superior salivatory nucleus (7) in the pons
psymp, secretomotor to lacrimal gland, nasal and oral cavities, submandibular and sublingual gland
what muscles are supplied by the facial nerve apart from facial expression
stapedius, stylohyoid, post belly digastric (2nd pharyngeal arch)
what are the limbs of the jaw jerk
mesencephalic nucleus of trigeminal
trigeminal motor nucleus
what arch are the muscles of mastication derived from
1st pharyngeal arch
what does v3 supply apart from the muscles of mastication
tensor tympani in the middle ear
tensor palate, mylohyoid and ant belly of digastric
what division is trigeminal neuralgia most often found in
v3
what supplies general sensation to the tongue, floor of the mouth, lower teeth and gums and carries chorda tympani (taste, secretomotor)
V3
what structures does V3 travel through
foramen ovale
into the infratemporal fossa
