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Neuro II- CN III

Thomadaki Fall 2010

QuestionAnswer
Origin of CN III - Oculomotor nucleus [motor] - Edinger-Westphal nucleus [parasympathetic]
Level of nuclei of CN III Midbrain at level of superior colliculus, anterior portion of PAG
CN III exits where? Interpeduncular fossa
Motor function of CN III Extraocular muscles [superior, medial, inferior rectus, inferior oblique, levator palpebrae superioris]
Parasympathetic function of CN III Pupillary constriction in response to light & accomodation for near vision (sphincter pupillae muscle) & thickening of lens during accommodation (ciliaris muscle)
Oculomotor parasympathetic fibers synapse with ____. Ciliary ganglion
Postganglionic parasympathetic fibers ride in __________ to ______ & ______ short ciliary nerves; sphincter pupillae; ciliaris muscles
Postganglionic sympathetic fibers from _______ use _______ to the ______ internal carotid plexus (from cervical sympathetic ganglia); short ciliary nerves; dilator pupillae
Exam for CN III Light & accomodation reflexes, vertical & medial eye movements; eyelid movement
Lesion to CN III Diplopia, pstosis, lateral strabismus, mydriasis, cycloplegia
CN III exits brain at Superior orbital fissure
What CN exit at SOF III, IV, V, VI
Created by: mrw2013
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