Cranial nerves Flashcards
What are the cranial nerves in order
olfactory
optic
occulomotor
trochlear
trigeminal
abducens
facial
vestibulocohlear
glassopharyngeal
vagus
spinal accessory
hyoglossal
what nerve is the nerve of small
olfactory nerve
olfactory nerve enters through
nasal cavity though the cribiform plate
what type of fiber is the olfactory nerve
SVA
effect of CN 1 lesion will result in
deficit in odor sensation on the same side of legion
what nerve is key for vision
optic nerve
Axons project…
through the optic chiasm to the superior colliculus and lateral geniculate
CN2 relays info to what
cortex
(optic nerve)
fibers on the medial side do what ?
fibers on the later side do what?
cross to the opposite side
stay on that side
function of CN2
fiber type
origin
effect of CN2 legion
transmit visual stimulus
SSA
ganglion cells of the retina
loss of vision in the affected eye, loss of reflex pupillary constriction
Oculomotor supplies the
muscles of the orbit
Oculomotor supplies how many muscles? and which are not
5
superior oblique and lateral rectus
function of CN3
constricting the pupil and accomodation of the lens for close-up vision
CN3 originates on the
CN3 enters the
the midbrain
orbit through the superior orbital fissure
Trochlear supplies
one voluntary muscle of the eye and the superior oblique
where does CN4 originates and leave from
midbrain
leaves through the skull through the superior orbital fissure
what does Abducens CN6 supplies
one muscle
what is the muscle that CN6 supplies
lateral rectus of the eye
CN6 originates and exits
on the caudal pons and exits the skull through that superior orbital fissure
Fiber types of CN3
GSE and GVE
what is the effect of a oculomotor nerve lesion
the affected eye would deviate to the opposite side that the lesion is on
function of CN4
depresses the eye and looks away from the nose
what fiber type is CN4
GSE
effect of trochlear nerve lesion
effected eye is extorted and deviated upwards
double vision
Trigeminal is CN
five
sensory distribution of CN 5 is
primary to skin and head and the upper teeth
the motor function of CN5 is
to the muscles of mastication
the trigeminal originates
on the pons
what fibers are in the CN 5
GSA and SVE
effect to the CN5 results in
loss of sensation to the face, cornea, mouth and nose
weakness of muscles of mastication (chewing)
facial nerve supplies
voluntary muscles of the face and scalp
Facial nerve carries taste to
2/3s of the anterior tongue
facial nerve originates at and exits
junction of pons with medulla
the skull through the stylomastoid foramen
CN 7 innervates what
submandibular and sublingual, lacrimal and glands of the nose and palate
the efferent limb of CN 7 is
corneal reflex
what are the fiber types of cn7
GVE, SVE, SVA, GVA, GSA
what is the effect of a facial nerve lesion
depends on the location
what are the two parts of CN 8 and what is the name
Cochlear root and Vestibular root
Vestibulocochlear
CN 8 originates on and exits
the medulla
the skull through the auditory meatus
what are the functions of CN8 two divisions
role in equilibrium and balance and regulates eye movements to coordinate body position
cochear nerve transmits hearing sensation
what is the fiber type of CN 8
SSA
what is the effect of CN 8 lesion
loss of balance and vertigo
What is CN9 and what does it innervate
Glassopharyngeal
sensory to pharynx, middle ear, , post 1/3 of tongue
motor to stylopharyngeus muscle
where does CN 9 originate and exit
medulla
skill via jugular foramen
what is the afferent limb of CN 9
gag reflex
major function of CN 9 (4)
transmits blood pressure
co2 and o2 concentration
taste sensation
mediates salvation and swallowing
what is the effect of a lesion on CN 9
reduced gag reflex, loss of carotis sinus reflex , reduced taste
CN 10 contains what type of fibers and for what
sensory fibers
pain and reflex
CN 10 originates in the and exits
medulla and jugular foramen
what is the major motor nerve of cn 10 to
pharynx and larynx
function of CN 10
moves muscles in larynx and pharynx
mediates secretion of gland, taste and sense from thorax and abdomen
what is the effect of vagus nerve lesion
uvula deviation but it deviates to opposite side of tongue
spinal accessory supplies two muscles what are they
trapezius and sternocleiodomastoid
where does CN 11 originate from and where does it exit
spinal cord
jugular foramen posterior to vagus nerve
function of CN 11
move head and shoulder and some muscles of larynx
effects of lesion on CN 11
shoulder droops scapular displaced laterally and inability to shrug the shoulder on the affected side
what does CN 12 supply and what is the nerve
muscles of the tongue
hypoglossal
CN 12 originates in the and exits the
medulla
hypoglossal canal
function of CN 12
moves tongue
effect of CN 12
weakness or paralysis of the tongue
when tongue sticks out it will protrude to the affected side
