Flashcards in Cranial nerves II Deck (19):
How do cranial nerves II-VI exit the skull?
through the sphenoid bone.
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
What passes through the superior orbital fissure?
CN III, IV, V-1, and 6. ophthalmic vein, sympathetics
What passes through the foramen rotundum?
What passes through the foramen ovale?
How does the middle meningeal artery exit the skull?
What passes through the internal auditory meatus?
CN VII and CN VIII
What passes through the jugular foramen?
CN IX, X, XI, and the jugular vein
What passes through the hypoglossal canal?
corneal reflex: afferent and efferent
afferent: V1; efferent: VII
lacrimation reflex: afferent and efferent
afferent: V1; efferent VII
Jaw jerk reflex
this is a muscle spindle response
V3 sensory to V3 masseter motor
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.
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)
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
What happens in a CNV motor lesion?
jaw deviation towards the side of the lesion because of unopposed force of opposite pterygoid muscle
What do you see in an CNX lesion?
uvula deviates AWAY from the lesion (weak side collapses and the uvula points away)
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)