Week 2 Part 2 Flashcards Preview

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Flashcards in Week 2 Part 2 Deck (11):

Which cranial nerve raises the eyelid?

3; Levator muscle


Where is the parasympathetic innervation of the CN3 going?

Iris sphincter: pupillary constriction.
Ciliary muscles: lens accommodation


Where are the cells of the GSE component of CN3?

Oculomotor nucleus of midbrain.


What is the location of the preganglionic neurons of CN3? Postganglionic?`

Preganglionic: Edinger-Westphal Nucleus of midbrain
Postganglionic: Ciliary ganglion


What is the function of the CN3 muscles?

Superior rectus: elevate and adduct
Inferior rectus: Depress and adduct
Medial rectus: adduct
Inferior oblique: elevate and abduct


What is the most common causes of CN3 injury?

Primary cause: Aneurysm at junction of posterior communicating and internal carotid artery
Secondary cause: aneurysm at junction of posterior communicating and posterior cerebral artery.


What is affected first by a vascular insult to CN3?

Somatic fibers; Patient presents with eye position problems but pupil reflex is normal.


What is affected first by a compressive insult to CN3?

Peripheral autonomic fibers; Patient presents with normal eye position/movements but pupil reflex is abnormal.


Where are the primary neurons of the abducens nerve?

Abducen nucleus; just under the 4th ventricle


How do you test the abducens nerve?

Tell patient to look laterally.


What is Foville Syndrome?

Damage to paramedian fibers of Basilar artery; Damage to CN6 and adjacent CST and CBT fibers.