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Neuro II- CN III
Thomadaki Fall 2010
| Question | Answer |
|---|---|
| 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 |