Cranial nerves II Flashcards Preview

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Flashcards in Cranial nerves II Deck (19):
1

How do cranial nerves II-VI exit the skull?

through the sphenoid bone.

2

How does CN II leave the skull and with what does it travel?

leaves through the optic canal with the ophthalmic artery and the central retinal vein

3

What passes through the superior orbital fissure?

CN III, IV, V-1, and 6. ophthalmic vein, sympathetics

4

What passes through the foramen rotundum?

CN V2

5

What passes through the foramen ovale?

CNV3

6

How does the middle meningeal artery exit the skull?

foramen spinosum

7

What passes through the internal auditory meatus?

CN VII and CN VIII

8

What passes through the jugular foramen?

CN IX, X, XI, and the jugular vein

9

What passes through the hypoglossal canal?

CN XII

10

corneal reflex: afferent and efferent

afferent: V1; efferent: VII

11

lacrimation reflex: afferent and efferent

afferent: V1; efferent VII

12

Jaw jerk reflex

this is a muscle spindle response
V3 sensory to V3 masseter motor

13

Where are the cavernous sinuses? What is their normal role?

Collection of venous sinuses on either side of the pituitary. blood from the eye and superficial cortex drains to the cavernous sinus, which drains to the internal jugular vein.

14

What structures pass through the cavernous sinus?

CN III, IV, V1, V2 and 6 and postganglionic sympathetics, as well as part of the internal carotid (EOM nerves plus V1, V2)

15

What is cavernous sinus syndrome? Causes and consequences

may be due to mass effect, fistula, or thrombosis. will cause decreased corneal and maxillary sensation with normal visual acuity. CNVI is commonly affected

16

What happens in a CNV motor lesion?

jaw deviation towards the side of the lesion because of unopposed force of opposite pterygoid muscle

17

What do you see in an CNX lesion?

uvula deviates AWAY from the lesion (weak side collapses and the uvula points away)

18

What is seen in a CNXI lesion?

shoulder droop on the side of the lesion
difficulty turning the head in the direction opposite the lesion (sternocleidomastoid)

19

CN XIIl lesion

hypoglossal lesion- tongue deviates toward the side of the lesion

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