Cranial Nerves And Their Trsts Flashcards
What is CN 1 called and what is its function
Olfactory nerve
Sense of smell (sensory)
What is CN 2 and what is its function
Optic
Vision (sensory)
What is CN 3 and what is its function
Oculomotor
Motor to eye muscles to move eye medially and dilate pupil
What is CN 4 and what is its function
Trochlear
Motor to eye muscle rotation
What is CN 5 and what is its function
Trigeminal nerve (both)
Three branches;
- mandibullar (motor of jaw muscles/ chewing)
- maxillary (sensory)
- opthalmic (sensory)
What is CN 10 and what is its function
Vagus nerve (both)
Parasympathetic supply
Sensory and motor to pharynx and larynx Parasympathetic to major internal organs
What is CN 6 and its function
Abducens
Motor to eye muscles
Innervates lateral rectus muscle (moves eye laterally)
What is CN 8 and its function
Vestobulocochlear- sensory
Hearing and balance
What is CN 9 and its function
Glossopharengeal
Both
Sensory to tongue
Motor to larynx and pharynx
What is CN 11 and its function
Accessory nerve
Motor to trapezius and 3 neck muscles
What is CN 12 and its function
Hypoglossal nerve
Motor nerve
Tongue
What is the test for CN 1
Walk past animal with sweets and see if they follow (don’t let them see)
What is the test for CN 2
Menace response (not in first 14 days of life as it’s learnt)
Pupillary light reflex
Tracking an object
What is the test for CN 3
Strabismus- check for normal alightment of the eye
Mydriasis- pupils can’t constrict so are dilated
Ptosis- can’t raise upper eyelid
What is the test for CN 4
Tracking
Extend head and look for stabismus (abnormal alignment of the eyes)
What is the test for CN 5
Check whether jaw is functioning and chewing is normal
jaw tone, muscle mass of jaw
Palpebral reflex- Check blink reflex (touch medial and lateral canthus which should cause blinking of eye)
What is the test for CN 6
Corneal reflex
Strabismus
What is the test for CN 7
Check for facial symmetry
Palpebral response
Menace test
What is the CN 8 test
Vestibular eye drop test
BAER ( checks hearing of dog)
Check for nystagmus (crazy movement of eyes)
What is the CN 9 test
Check Swallowing and watch eating
endoscopy
What is the cranial nerve 10 test
Watch eating
Slap test (horses)
Bark
Endoscopy
Gag reflex
HR
BP
What is CN 11 test
Watch eating
Watch neck movement
What is the CN 12 test
Deviation of tongue to the side of the lesion
Do tongue retraction test
Where does CN 1 leave the skull
Cribs canal
Where does CN 2 leave the skull
Optic canal
Where does CN 3 leave the skull
Orbital fissure
Where does CN 4 leave the skull
Orbital fissure
Where does the opthalmic branch of CN 5 leave
Orbital fissure
Where does the maxillary branch of the CN 5 leave
Foramen rotundum
Where does the mandibular branch of the CN 5 leave skull
Foramen ovals
Where does the CN 6 leave the skull
Orbital fissure
Where does the facial nerve leave the skull
Internal acoustic meatus
Where does the CN 8 leave the skull
Internal acoustic meatus
Where does CN 9 leave the skull
Jugular foramen
Where does CN 10 exit the skull
Jugular foramen
Where does CN 11 leave the skull
Jugular foramen
Where does CN 12 exit the skull
Hypoglossal canal
What muscles does oculomotor nerve innervate
Superior rectus
Inferior rectus
Medial rectus
Inferior oblique
What muscles are innervated by trochlear nerve
Superior oblique muscle
What does the abductens nerve innervate
Lateral rectus \
