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85 Cards in this Set

  • Front
  • Back
"neruoaxis" - refers to what?
full craniocaudal extent of the central nervous system
neraxis - how many parts? name them in order
-cerebral hemispheres
-spinal cord
cerebral hemispheres - what CN are located here?
deincephalon - what CN are located here?
Midbrain - what CN are located here?
CN3 & CN4
pons - what CN are located here?
CN5 - CN7
medulla - what CN are located here?
CN8 - CN12
spinal cord - what nerves are located here?
spinal nerves
CN1 - name?
Olfactory N
CN1/olfactory n - passes though?
cribiform plate (ethmoid)
CN1/olfactory n - function
-sense of smell
CN1/olfactory n - damage to results in?
anosmia (loss of ability to smell)
CN2 - name?
optic n
CN2/optic n - passes from ____ posteriorly through ____, exiting through ______.
-optic canal
CN2/optin n - an important reorientation of fibers occurs at what?
optic chiasma
optic tracts - function
sight toward the contralateral side in each eye
CN2/optic n - function
CN2/optic n - damage to results in?
anopsias (visual field defects)
CN3 - name?
oculomotor n
CN3/oculomotor n - passes through _____ and then into the ____ via the ______.
-cavernous sinus
-superior orbital fissure
CN3/oculomotor n - motor function
-most of extraoccular mm
-levator palpebrae
CN3/oculomotor n - parasympathetic function
-contrictor pupillae (constricts pupils)
CN3/oculomotor n - damage to results in?
-strabismus (deviation of gaze)
-diplopia (double vision)
-ptosis (droopiness)
-pupillary dilation
CN4 - name?
trochlear n
CN4/trochlear n - what is special about it?
only nerve to exit dorsal aspect of the brainstem
CN4/trochlear n - passes through?
superior orbital fissue
CN4/trochlear n - innervates?
superior oblique m.
CN4/trochlear n - function
turns gaze down and out
CN4/trochlear n - damage to results in?
-strabismus (lazy eye)
-diplopia (double vision)
CN6 - name?
abducens n
CN6/abducens n - passes through what, to enter the what?
superior orbital fissure
-to enter the orbit
CN6/abducens n - innervates?
lateral rectus m
CN6/abducens n - damage to results in?
-diplopia (double vision)
-medial strabismus (lazy eye)
CN5 - name?
trigeminal n
CN5/trigeminal n - branches?
-CN5I: opthamalic division
-CN5II: maxillary division
-CN5III: mandibular division
CN5/trigeminal n - function?
-general somatic sensation
-mm of mastication (mandibular division)
CN5I/opthamalic division - passes through? exits through?
-superior orbital fissure into orbit
-exits through supraorbital notch/foramen
CN5I/opthamalic division - innervates?
skin on forehead
CN5II/maxillary division - passes through?
-foramen rotundum
-inferior orbital fissure
CN5II/maxillary division - innervates?
-upper teeth
-skin over maxilla bone
CN5II/maxillary division - what branch comes off?
infraorbital n.
CN5III/mandibular division - goes through?
foramen ovale
CN5III/mandibular division - innervates?
-mm of mastication
-skin of lower jaw
-teeth of lower jaw
CN5III/mandibular division - what branches come off?
-lingual n
-buccal n
-inferior aveolar n
inferior aveolar n becomes _____ after it passes through _____.
-mental n.
-mental foramen
CN5I - name?
opthamalic division
CN5II - name?
maxillary division
CN5III - name?
mandibular division
CN5/trigeminal n - damage to results in?
-ipsilateral sensory disturbances
-weakness in the muscles of mastication
-weakness in tensors tympani
-weakness in palati
CN7 - name?
Facial n
CN7/facial n - passes through?
internal auditory meatus
CN7/facial n - branches?
chorda tympani
(along with TZBMC)
CN7/facial n - function?
taste for anterior 2/3rds of tongue
CN7/facial n - exits skull through?
stylomastoid foramen
CN7/facial n - innervates
-mm of facial expression
-posterior digastric
CN7/facial n - damage to results in?
Bell's Palsy
-weakness of muscles of facial expression
-loss of taste in anterior 2/3rds of tongue
chorda tympani - function
taste in anterior 2/3rds of tongue (branch of facial n)
CN8 - name?
vestibulocochlear n
CN8/vestibulocochlear n - passes through?
internal auditory meatus
CN8/vestibulocochlear n - function
CN8/vestibulocochlear n - branches?
-vestibular n
-cochlear n
CN8/vestibulocochlear n - damage to vestibular n?
-nystagmus (involentary movement of eyeballs)
CN8/vestibulocochlear n - damage to cochlear n?
ipsilateral hearing defects
CN9 - name?
glossopharyngeal n
CN9/glossopharyngeal - passes through?
jugular foramen
CN9/glossopharyngeal - function
-taste AND sensation of posterior 1/3 of tongue
- sensation at pharyngeal wall and soft palate
-afferent for carotid sinus and body
CN9/glossopharyngeal - innervates?
-stylopharyngeus m
-parotid gland
-pharyngeal wall/soft palate
-carotid sinus/body
CN10 - name?
Vagus n
CN10 - vagus n - passes through?
jugular foramen
CN10/vagus n - parasympathetic functions
-smooth muscles
-glands of splenic flexure of GI tract
-inhibits heart
CN10/vagus n - motor functions
-all skeletal mm of larynx and pharynx (EXCEPT stylopharyngeus)
-all mm of the palate (NOT tensor veli palatini)
CN10/vagus n - sensory and afferent functions
muscous membranes of:
-lower pharynx
-splenic flexure
-gall bladder
afferent from aortic arch and body
CN11 - name?
Spinal accessory n
CN11/spinal accessory n - passes though?
foramen magnum
CN11/spinal accessory n - exits?
jugular foramen
CN11/spinal accessory n - innervates?
-laryngeal mm
CN11/spinal accessory n - function?
accessory to vagus n
CN12 - name?
hypoglossal n
CN12/hypoglossal n - passes through?
hypoglossal canal
CN12/hypoglossal n - innervates?
-intrinsic mm of tongue
-external mm of tongue
(genioglossus, hypoglossus, styloglossus)
NOT palatoglossus
CNs - parasympathetic divisions of ANS
CNs - "special senses"
CNs - supply ONLY skeletal mm
(CN3 has parasympathetic)
CNs - ONLY sensory
(rest supply skeletal mm)
CNs - both sensory and motor