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Flashcards in Week 4.0 - Cranial Nerves Deck (62)
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1

How do CNI and II differ from the rest?

-They are atypical in that they are brain tracts (outpouchings of axons)

2

What is a pneumonic to remember the cranial nerves?

-Oh, Oh, Ot, to touch and feel very good vagina ah heaven
-olfactory, optic, oculomotor, trochlear, Trigeminal, abducens, facial, vestibulocochlear, glossopharyngeal, vagus, accessory spinal, Hypoglossal

3

What is a pneumonic to remember each of the cranial nerve types?

-Some Say Marry Money but my brother says big boobs matter more
-Sensory, sensory, motor (a), motor, both, motor, both (a), sensory, both(a), both(a), motor, motor

4

Which cranial nerves originate in the midbrain?

-3/4

5

Which cranial nerves originate in the pons?

-5,6,7

6

Which cranial nerves originate in the medulla oblongata?

-8,9,10,11,12

7

Name Cranial nerve I
What type of nerve is it?
Where is it from/to?
What is its function?

-Olfactory
-Sensory
-Olfactory mucosa through cribriform plate to form olfactory bulb to olfactory tract
-Sense of smell

8

Where is cribriform plate?

-Ethmoid bone

9

What is anosmia?

-Lack of smell

10

Give 3 major causes of anosmia

-Upper respiratory tract infection
-Trauma (eg fracture cribriform plate damages nerves)
-Meningitis

11

How do you test CNI?

-Ask patient to smeel coffe/orange/smelling salts

12

Name CN II
What type of nerve is it?
Where if is from/to?
What is its function?

-optic nerve
-Sensory
-Complex pathway from the retina to optic tract through optic canal then primary visual cortex
-Sight

13

How do you test CNII?

-Visual acuity (snellen chart)
(-Colour Vision)
-Visual fields
-Pupillary reflexes
-Fundoscopy

14

Name CNIII
What type of nerve is it?
Where is it from/to?
What is its function

-Oculomotor
-Motor (parasympathetic)
-From Oculomotor nucleus (edinger-westphal nucleus) in midbrain to most extraocular muscles
-Move eyeball/eye lid (pupillary constriction)

15

Name the muscles which oculomotor nerve innervates

-Inferior oblique
-Superior, inferior, medial rectus
-Levator palpabrae Superioris
(-Pupillae constrictor)

16

Through which foramina does optic nerve pass?

-Optic canal

17

Through which foramina foes oculomotor nerve pass?

-Superior orbital fissure

18

How do you test oculomotor nerve?

-H test

19

How would a strict oculomotor nerve palsy present?

-Down and out pupil
-Ptosis

20

How will a complete oculomotor nerve palsy present?

-Down and out pupil
-Ptosis
-Myadriasis (blown pupil)

21

Name CN IV
What type of nerve is it?
Where is it from/to?
What is its function?

-Trochlear
-Motor
-From trochlear nucleus in dorsal Midbrain to superior oblique of the eye
-Look down and in (Moves the eye down when the eye is adducted - also contributes to abduction and depression although weakly)

22

What is special about trochlear nerve?

-It has the longest intracranial length

23

What structures travel through the cavernous sinus?

-CN III, IV, V(V1/V2) VI,
-Internal carotid artery

24

Through which foramina does trochlear travel?

-Superior orbital fissure

25

Why might someone wih trochlear nerve palsy have a slight head tilt?

-To compensate for the diplopia they are experiencing, especially when walking downstairs as cant look down and in

26

How might an infection in the face/sinus/teeth etc cause problems with trochlear nerve?

-Facial veins are valveless, the infection can track back to cavernous sinus -> cavernous sinus thrombosis -> life threatening needs immediate treatment

27

Name CNV
What type of nerve is it
Where is it from/to
What is its function?

-Trigeminal
-Sensory and motor
-Trigeminal nucleus in the pons, splits into 3 branches (V1/2/3)
-General sensation to the face, muscles of mastication

28

Through which foramina do the branches of trigeminal nerve travel?

-Opthalmic -> superior orbital fissure
-Maxillary -> foramen rotundum
-Mandibular -> foramen ovale

29

What is trigeminal neuralgia?

-Sensory hyperactivity of the trigeminal nerve which sends shooting/burning pain along the distribution of the nerve

30

Why is trigeminal nerve important in numbing the lower teeth?

-Inferior alveolar nerve is branck of trigeminal and is blocked to numb teeth