Cranial nerve anatomy Flashcards Preview

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Flashcards in Cranial nerve anatomy Deck (49):
1

Cribriform plate

Olfactory nerve (I)
Meninges

2

Optic Foramen

Optic Nerve (II)
Opthalmic Artery

3

Superior Orbital Fissure
N.b. all cranial nerves passing through here move the eyes

Occulomotor (III)
Trochlear (IV)
Ophthalmic branch of Trigeminal (V1)
Abducens (VI)
Ophthalmic veins

4

Occulomotor

Originates: Mid-brain
Controls all extraocular muscles (except sup oblique and lateral rectus _ LR6SO4) and levator palpebrae superioris

5

Occulomotor
Route

Emerges from brain
CN III passes btwn sup cerebellar and post cerebral arteries
pierces dura mater
runs along the lateral wall of the cavernous sinus

6

Foramen Rotundum

Maxillary branch of the Trigeminal (V2)

7

Foramen Ovale

Mandibular branch of the Trigeminal (V3)

8

Foramen Spinosum

Middle Meningeal Artery

9

Foramen Lacerum

Crossed by the Internal Carotid Artery

10

Internal Acoustic Meatus

Facial nerve (VII)
Vestibulocochlear nerve (VII)
Labyrinthine artery

11

Jugular Foramen

Glossopharyngeal nerve (IX)
Vagus nerve (X)
Accesory nerve (XI)
Inferior petrosal sinus
Sigmoid sinus

12

Hypoglossal foramen

Hypoglossal nerve (XII)

13

Foramen Magnum

Midbrain: runs superiorly through the opening to join with the diencephalon
Vertebral Artery
XIsp
Meninges
CSF

14

Cranial Nerves

I - OLFACTORY
II - OPTIC
III- OCCULOMOTOR
IV - TROCHLEAR
V - TRIGEMINAL
VI - ABDUCENS
VII - FACIAL
VIII - VESTIBULOCOCHLEAR
IX - GLOSSOPHARYNGEAL
X- VAGUS
XI - ACCESSORY
XII - HYPOGLOSSAL

15

Cranial nerves 3,4 & 6

All move the eye
CN III - Occulomotor
CN IV - Trochlear
CN VI - Abducens

16

Hypoglossal nerve CN XII

Moves the tongue

17

Cranial nerve pneumonics

On Old Olympic Tower Tops A Finn And German Viewed Some Hops

To know if a CN is Sensory, Motor or Both:
Some Say Marry Money But My Brother Say Big Boobs Matter More

18

Anterior Portion of Brain

- CN I Olfactory
- CN II Optic
- CN III Occulomotor
- CN IV Trochlear

19

Pons

- CN V Trigeminal
- CN VI Abducens
- CN VII Facial
* CN VIII Vestibulocochlear: arises in the inner ear and goes to the pons

20

Medulla Oblongata

- CN IX Glossopharyngeal
- CN X Vagus
- CN XI (spinal) Accessory)
- CN XII Hypoglossal

21

Difference between Optic Nerve & Optic Tract

Optic Nerve:
- Just nerve fibres from one side
Optic Tract:
- Fibres from both sides

22

Functional anatomy of cranial nerves

Chewing & swallowing (tasting and smelling)
Talking
Looking
Non-verbal communication (facial expressions)
Hearing

23

Sensory CN
(Afferent only)
* Sensory part lies in the periphery

Olfactory - CN I
Optic - CN II
Vestibulocochlear - CN VIII

24

Motor CN
(Efferent only)

Occulomotor - CN III
Trochlear - CN IV
Abducens - CN VI
(Spinal) Accessory - CN XI
Hypoglossal - CN XII

25

Mixed CN
(Both Afferent and Efferent)

Trigeminal - CN V
Facial - CN VII
Glossopharyngeal - CN IX
Vagus - CN X

26

Cranial nerves that have an AUTONOMIC part
They carry the "cranial" part of the craniosacral autonomic or parasympathetic outflow from the CNS
- 4 of them

CN III - Occulomotor
CN VII - Facial
CN IX - Glossopharyngeal
CN X - Vagus

27

CN Sensory Supply
- Cutaneous

Scalp
Face
Neck

28

CN Sensory Supply
- Non-cutaneous

Oral cavity (mucosa, tongue and teeth)
Cornea
Nasal Cavity & Paranasal sinuses
Pharynx
Larynx
Tympanic Membrane

29

CN Sensory Supply
- Articular

TMJ - temperomandibular joint
Cervical vertebrae
Atlanto-occipital joint

30

CN Motor Supply

Muscles of facial expression
Muscles of mastication
Extra-ocular muscles
Muscles of the tongue
Muscles of the larynx and pharynx
Cervical muscles

31

Cranial nerve(s) responsible for:
- Smell

CN I Olfactory

32

Cranial nerve(s) responsible for:
- Visual acuity
- visual fields
- ocular fundi

CN II Optic

33

Cranial nerve(s) responsible for:
- Pupillary reactions

CN II Optic
CN III Oculomotor

34

Cranial nerve(s) responsible for:
- Extra-ocular movements, including opening of the eyes

CN III Oculomotor
CN IV Trochlear
CN VI Abducens

35

Cranial nerve(s) responsible for:
- Facial sensation
- movements of the jaw
- corneal reflexes

CN V Trigeminal

36

Cranial nerve(s) responsible for:
- Facial movements
-gustation (ant 2/3rds tongue)

CN VII Facial

37

Cranial nerve(s) responsible for:
- Hearing
- balance

CN VIII Vestibulocochlear

38

Cranial nerve(s) responsible for:
- Swallowing
- Elevation of the palate
- Gag reflex
- Gustation (post 1/3rd tongue)

CN IX Glossopharyngeal
CN X Vagus

39

Cranial nerve(s) responsible for:
- Voice
- Speech

CN V Trigeminal
CN VII Facial
CN X Vagus
CN XII Hypoglossal

40

Cranial nerve(s) responsible for:
- Shrugging the shoulders
- Turning the head

CN XI Spinal Accessory

41

Cranial nerve(s) responsible for:
- Movement and protrusion of the tongue

CN XII Hypoglossal

42

Abducens Nerve
- Passes through the SOF

Supplies Lateral Rectus Muscle
- allows you to move eyes laterally

43

Facial Nerve CN VII
- passes through the IAM

Comes out just below the ear and passes through the Parotid (salivary gland)
Part of it carries sensation from the outside of the ear
Branch of the nerve carries taste sensation from the front 2/3rds of the tongue
splits into several branches
Controls the muscles of facial expression
Simulates the salivary glands to produce saliva

44

Glossopharyngeal Nerve (CN IX)

Sensory: to oropharynx
Motor: only to stylopharyngeus muscle

45

Only cranial nerve to exit the brainstem on the posterior side

CN IV Trochlear

46

Largest CN

Trigeminal

47

Longest CN

CN X Vagus
- reaches from the Medulla to the digestive and urinary organs

48

CN's that carry sensory info about B.P. to the brain?

CN IX Glossopharyngeal
CN X Vagus

49

CN primarily responsible for pupillary constriction

CN III Occulomotor