C Cranial nerves Flashcards
Where are cranial nerve nuclei?
in brainstem
Where are the sensory nuclei located?
laterally
Where is the motor nuclei located?
medially
What is cranial nerve I?
olfactory nerve
What is the location of CN 1?
olfactory bulbs, tracts and forebrain
What foramen does the CN 1 pass through?
cribiform plate
What is the function of CN 1?
smell = olfaction
What is the test for CN 1?
offer familiar smell - orange
What is CN II?
Optic nerve
What is the location for CN II?
Optic chiasma, optic tract and diencephalon
What foramen does CN II pass through?
optic canal
What is the function of CN II?
vision
Where are the olfactory and the optic nerve derived from?
Forebrain
What is CN III?
Occulomotor nerve
What is the location of the CN III?
pontomesencephalic junction
What is the foramen for CN III?
Superior orbital fissure
What is the function of CN III?
4/6 Extraoccular muscles
What is the test for CN III?
follow finger
What is CN IV?
trochlear nerve
What is location for CN IV?
dorsal midbrain
What foramen does CN iV run through?
superior orbital fissure
What is the function of CN IV?
superior oblique (SO4)
What is the test for CN IV?
follow finger test
What is CN VI?
Abducens
What is location for CN VI?
pontomedullary junction
What is the foramen for CN VI?
superior orbital fissure
What is the function of CN VI?
Lateral rectus (LR6)
What is the test for CN VI?
follow finger test
What is CN V?
Trigeminal nerve
What are the division for CN V?
V1 - opthalmic nerve
V2 - Maxillary nerve
V3 - mandibular nerve
What is the location for CN V1?
Pons
What foramen does CN V1 go through?
Superior orbital fissure
What is the function of V1?
Sensation from upper face - eye
What is the test for V1?
cotton wool test
What is the location for V2?
Pons
What foramen does V2 run through?
foramen rotundum
What is the function of V2?
sensation for middle face
What is the test for V2?
Cotton bud on cheek
What is the location for V3?
pons
What foramen does V3 go through?
foramen ovale
What is the function of V3? (2)
- sensation form lower face
2. motor of muscles of mastication
What are the tests for V3? (3)
- clench teeth and feel muscle mass
- cotton bud on jaw
- jaw jerk reflex
What are the 4 autonomic ganglia associated with the trigeminal nerve?
- ciliary ganglion
- pterygopalatine
- submandibular
- otic
What is CN VII?
facial nerve
What is the location of CN VII?
cerbellopontine angle
What foramen does CN VII go through?
internal acoustic meatus
What is the function of CN VII? (3)
- muscles of facial expression
- Taste to anterior 2/3rds of tongue
- Parasympathetic to all gland except parotid
What is CN VIII?
vestibulocochlear nerve
What is the location for CN VIII?
cerbellopontine angle
What foramen does CN VIII go through?
internal acoustic meatus
What is the function of CN VIII?
hearing and balance
What are the tests for CN VIII?
Rinnes and Webers
What is CN IX?
Glossopharyngeal
What is the location of CN IX?
- posterolateral sulcus of the medulla
2. lateral to the olives
What foramen does CNIX run through?
jugular foramen
What is the function of CN IX and what is the test? (5)
- swallowing
- parasympathetic to parotid
- taste to posterior 1/3 of tongue
- cutaneous sensation from ear
- sensation from carotid body
Gag reflex
What is CN X?
Vagus nerve
What is the location for CN X ?
- posterolateral sulcus of medulla
2. lateral to olives
What is foramen does CN X run through?
jugular foramen
What is the function of CN X? (3)
- muscles from pharynx and larynx
- parasympathetic to thoracic and GI
- taste from epiglottis and palate
What is CN XI?
Accessory
What is the location for CN XI? (2)
- caudal medulla
2. rostral spinal cord
What foramen does the CN XI run through?
jugular foramen
What is the function of CN XI? (2)
- motor to SCM
2. motor to trapezius
What is the test for CN XI?
shrug shoulders and rotate head
What is CN XII?
hypoglossal nerve
What foramen doe stye hypoglossal nerve run through?
hypoglossal canal
What is the function of the hypoglossal nerve?
Motor to muscles of the tongue
What is the location of CN XII go through?
anterolaterla sulcus between the olives and pyramids
What is the text for CN XII?
protrude tongue