Clinically Relevant Anatomy of Cranial Nerves Flashcards Preview

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Flashcards in Clinically Relevant Anatomy of Cranial Nerves Deck (25)
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1
Q

Intracranial course of olfactory nerve (CN I) and connection to brain.

A

Olfactory nerves synapse in the olfactory bulb then travel to cortical areas in the olfactory tract.

2
Q

Intracranial course of optic nerve (CN II) and connection to brain

A

Travels around the pituitary stalk to the optic chasm, forming the optic tract. Diencephalon

3
Q

Intracranial course of oculomotor nerve (CN III) and connection to brain

A

Travels to the orbit in the lateral wall of the cavernous sinus. Mesencephalon

4
Q

Intracranial course of trochlear nerve (CN IV) and connection to brain.

A

Travels towards the orbit in the lateral wall of the cavernous sinus. Mesencephalon

5
Q

Intracranial course of Abducent nerve (CN VI) and connection to brain.

A

Travels towards the orbit WITHIN the cavernous sinus. Pontomedullary junction.

6
Q

Intracranial course of Vestibulochochlear (CN VIII) and connection to brain.

A

Travels posteromedially from the internal acoustic meatus to the pontomedullary junction.

7
Q

Intracranial course of accessory nerve (CN XI) and connection to brain.

A

Ascends through foramen magnum then travels towards the jugular foramen in the posterior cranial fossa. Cervical spinal cord.

8
Q

Intracranial course of hypoglossal nerve (CN XII) and connection to brain.

A

Passes anteriorly to hypoglossal canal. Rootlets to lateral pyramids of medulla.

9
Q

Upon exiting the cranium, what structure does CN XII descend with?

A

Carotid sheath.

10
Q

Intracranial course of trigeminal nerve (CN V) and connection to the brain.

A

travels inferior to the edge of the tentorium cerebella between the posterior and middle cranial fosse. Pons, laterally.

11
Q

What are the 3 divisions of the trigeminal nerve and what modality are they?

A

Ophthalmic (CNV1) - sensory
Maxillary (CNV2) - sensory
Mandibular (CNV3) - sensory and motor

12
Q

Intracranial course of the facial nerve (CN VII) and connection to brain.

A

Travels directly into acoustic meatus in posterior cranial fossa. Pontomedulalry junction, anterolaterally.

13
Q

Intracranial course of the glossopharyngeal nerve (CN IX) and connection to brain.

A

Travels directly towards jugular foramen in the posterior cranial fossa. Lateral aspect of superior medulla oblongata

14
Q

Intracranial course of the vagus nerve (CN X) and connection to the brain.

A

Travels directlytowards jugular foramen in the posterior cranial fossa. Lateral aspect of medulla oblongata (inferior to CN IX).

15
Q

What structure does the vagus nerve descend in?

A

Carotid sheath.

16
Q

How do you test the optic nerve (CN II)?

A

Light reflexes, visual field testing, snellen chart

17
Q

How do you test the oculomotor nerve (CN III)?

A

Extra ocular eye movements (H test).

18
Q

How do you test the trochlear nerve (CN IV)?

A

Extra ocular eye movements (in and down).

19
Q

How do you test the trigeminal nerve (CN V)?

A

Facial sensation, power of muscles of mastication.

20
Q

How do you test the abducent nerve (CN VI)?

A

Extra ocular eye movements (lateral gaze)

21
Q

How do you test the facial nerve (CN VII)?

A

Power of muscles of facial expression

22
Q

How do you test the vestibulochochlear nerve (CN VIII)?

A

Rinne & Weber tests

23
Q

How do you test the vagus nerve (CN X)?

A

Elevation of the soft palate, assess for normal swallowing and speech

24
Q

How do you test the spinal accessory nerve (CN XI)?

A

Turning of head & shrugging shoulders

25
Q

How do you test the hypoglossal nerve (CN XII)?

A

Protrusion of the tongue