Definitions for fourth cranial nerve
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Princeton's WordNet
trochlear, trochlear nerve, trochlearis, fourth cranial nerve(noun)
either of the two cranial nerves on either side that control the superior oblique muscles of the eyes
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"fourth cranial nerve." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/fourth cranial nerve>.

