Clinical anatomy of cranial nerves Flashcards Preview

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Flashcards in Clinical anatomy of cranial nerves Deck (57)
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1

What runs in the cribriform plate of the ethmoid bone?

Olfactory nerve

2

What is the contents of the optic canal of the sphenoid bone?

Optic nerve and the ophthalmic artery

3

In what bone is the superior orbital fissure?

Sphenoid

4

What runs in the SOF?

Lacrimal nerve
CN V1
Superior ophthalmic vein
CN 4
CN 3
CN 6
Inferior ophthalmic vein

5

What runs in the foramen rotundum?

Maxillary nerve

6

What runs in the foramen ovale?

Mandibular nerve

7

What runs in the internal acoustic meatus?

Facial nerve
Vestibulocochlear nerve
Vestibular ganglion
Labyrinthe artery

8

What runs in the jugular foramen?

Inferior petrosal sinus
Glossopharyngeal nerve, vagus nerve and spinal accessory nerve
Sigmoid sinus

9

In what bone is the internal acoustic meatus?

Petrous part of temporal bone

10

In what bone is the hypoglossal canal?

Occipital bone

11

What runs in the hypoglossal canal?

Hypoglossal nerve

12

What runs in the foramen magnum?

Medulla
Meninges
Vertebral arteries
Anterior and posterior spinal arteries
Dural veins

13

What runs in the foramen spinosum?

Middle meningeal artery

14

Where will the optic nerve connect with the CNS?

Diencephalon at the lateral geniculate nucleus where it will then radiate to the visual cortex at the occipital lobe

15

How can the optic nerve be tested?

Acuity - snellen
Colour - ishihara
Fields
Reflexes
Fundoscopy

16

Where does the oculomotor nerve originate?

Midbrain

17

What are the contents of the cavernous sinus?

Oculomotor nerve
Trochlear nerve
Ophthalmic branch of trigeminal nerve
Maxillary branch of trigeminal nerve
Internal carotid artery
Abducens nerve

18

Where does the trochlear nerve originate?

Midbrain

19

Where does the abducens nerve originate?

Pontomedullary junction

20

How are CN 3,4 and 6 tested?

H test - eye movements

21

Where does the vestibulocochlear nerve originate?

Pontomedullary junction

22

How is the vestibulocochlear nerve tested?

Rinne
Weber

23

Describe rinne and weber testing?

Rinne - hold infront of ear and then on mastoid. In conducive hearing loss, you will hear better when on mastoid whereas in sensorineural you will hear better in air
Weber - hold tuning fork on head - sensorineural it will lateralise to normal ear but in conduction it will go towards affected ear

24

Where does the spinal accessory nerve originate on the CNS?

Cervical spinal cord - top 4 segments

25

How is the spinal accessory nerve tested?

Shug shoulders = trapezius
Turn head to flex neck and turn head towards opposite side

26

Where does the hypoglossal nerve connect with the CNS?

Via many rootlets lateral to the pyramids of the medulla oblongata

27

Where will the hypoglossal canal descend?

Lateral to the carotid sheath
At level of hyoid, tuns anteriorly towards lateral aspect of tongue

28

What is the medullary olive?

Inferior olive - cerebellar system
Superior orlive - pons and part of the auditory system, aiding the perception of sound

29

What innervates the palatoglossus muscle?

Vagus nerve

30

How is the hypoglossal nerve tested?

Stick tongue straight out
If there is unilateral pathology - the tongue tip will point towards the injured nerve
The Tongue tells the Truth