L8 - Cranial Nerves Flashcards Preview

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Flashcards in L8 - Cranial Nerves Deck (33):
1

CN 1

Olfactory nerve

2

CN 2

Optic nerve

3

CN 3

Oculomotor nerve

4

CN 4

Trochlear nerve

5

CN 5

Trigeminal nerve

6

CN 6

Abducens nerve

7

CN 7

Facial nerve

8

CN 8

Vestibulocochlear nerve

9

CN 9

Glossopharyngeal nerve

10

CN 10

Vagus nerve

11

CN 11

Accessory nerve

12

CN 12

Hypoglossal nerve

13

Cranial nerve nuclei:
How many?
Where do they act?
What do they do?

Can have one or many nuclei depending on the activity of the nerve.
Act ispilaterally - will be on the side of the brain that controls it's function (except for CN4 trochlear nerve)
Nuclei can be involved in controlling the activity of a number of different nerves

14

General somatic sensory

Skin

15

General visceral sensory

Viscera

16

Special somatic sensory

Sight, sound, balance

17

Special visceral sensory

Taste, smell

18

Olfactory nerve:
Exit?
Modality?
Function?

CN 1
Exit: cribriform plate, projects back via olfactory tract
Modality: SVS
Function: smell

19

Optic nerve:
Exit?
Modality?
Function?
Nerve damage?

CN 2
Exit: optic canal (passes through this from retina to optic chiasma, which then trasvels via optic tract to LGN to visual cortex)
Modality: SSS
Function: vision

NB: nerve damage prior to optic chiasma will lead to blindess in that one eye, but nerve damage post optic chiasma will lead to partial blindess in both eyes (after this stage it carries a bit from each eye)

20

Oculomotor nerve:
Exit?
Modality?
Function? (which 4 muscles)

CN 3
Exit: superior orbital fissure
Modality: GSM and GVM
Function: vision, controls movement of the eye muscles (superior rectus, medial rectus, inferior rectus and inferior oblique), pupillary sphincter

21

Trochlear nerve:
Exit?
Modality?
Function? (1 musc)

CN 4
Exit: superior orbital fissure
Modality: GSM and GVM
Function: vision, controls superior oblique eye muscle (inwards rotation of eye)

22

Abducens nerve:
Exit?
Modality?
Function? (1 musc)

CN 6
Exit: superior orbital fissure
Modality: GSM and GVM
Function: vision, abduction of eye (lateral rectus)

23

Trigeminal nerve:
Three branches?
Exit?
Modality?
Function?

CN 5

Three branches: ophthalmic, maxillary, mandibular.
Exit: superior orbital fissure/foramen rotundum/foramen ovale
Modality: GSM and some SVM
Function: sensory supply with the mandibular branch having some motor.
Ophthalmic - scalp, forehead, nose, down to upper eyelid.
Maxillary - lower eyelid, cheek, nasal mucosa, palate, upper lip.
Mandibular - anterior tongue, skin over jaw, mastication muscles

24

CN 5 (trigeminal) first branch:

Ophthalmic:
Supplies sensory from scalp to upper eyelid.
Exits via superior orbital fissure

25

CN 5 (trigeminal) second branch:

Maxillary:
Supplies sensory from lower eyelid to upper lip.
Exits via foramen rotundum

26

CN 5 (trigeminal) third branch:

Mandibular:
Supplies sensory from lower lip, over jaw.
Supplies motor to mastication muscles.
Exits via foramen ovale

27

Trigeminal neuralgia

CN 5 disorder.
Painful condition where slight stimulation to the skin = massive pain.
Treatment: cut the trigeminal nerve but will then lose sensation in that whole area.

28

Facial nerve:
Branches?
Exit?
Modality?
Function?

CN 7
Branches: temporal, zygomatic, buccal, mandibular, cervical
Exit: internal acoustic meatus
Modality: all
Function:
- sensation to ext ear
- control of muscles involved in facial expression (move mouth, cheek etc.)
- control eyelid along with CN 5 in corneal reflex
- taste from anterior tongue and palate
- glands

29

Vestibulocochlear nerve:
Branches?
Exit?
Modality?
Function?

CN 8
Branches:
- auditory: spiral ganglion sends auditory nerve to auditory meatus to vesibulocochlear nerve
- vestibular: superior, inferior and posterior divisions
Exit: internal acoustic meatus
Modality: SSS
Function: balance and sound information to vestibular and auditory system

30

Glossopharyngeal nerve:
Branches?
Exit?
Modality?
Function?

CN 9
Exit: jugular foramen
Modality: all
Function:
- sensory: posterior 1/3 of tongue, tonsil, pharynx, middle ear
- motor: stylopharyngeus, upper pharyngeal muscles, parotid gland

NB: tympanic and sinus nerve comes off, innervate inner ear and carotid body (responsible for pH monitoring)

31

Vagus nerve:
Branches?
Exit?
Modality?
Function?

CN 10
Only cranial nerve to project down into body.
Branches: pharyngeal branch, superior laryngeal branch, recurrent laryngeal branch
Exit: jugular foramen
Modality: all
Function:
- sensory to external ear, larynx, pharynx
- sensory to abdo and thoracic viscera
- taste from epiglottis region of tongue
- motor to smooth muscle of pharynx, larynx, GI tract
- innervates the heart

32

Accessory nerve:
Exit?
Modality?
Function?

CN 11
Exit: jugular foramen
Modality: motor and sensory
Function:
- motor to trapezius and sternocleidomastoid musc (head rotation and shrugging shoulders)
- sensory to viscera

33

Hypoglossal nerve:
Exit?
Modality?
Function?

CN 12
Exit: hypoglossal canal
Modality: motor
Function: tongue muscles