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20 adult cadaver sides were dissected, using an operating microscope, in order to better understand the trochlear nerve anatomy. The findings concluded that there is a fourth segment of the trochlear nerve, roughly 4 mm in length, called the trigonal segment.

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This page is a summary of: A New Segment of the Trochlear Nerve: Cadaveric Study with Application to Skull Base Surgery, Journal of Neurological Surgery Part B Skull Base, August 2013, Thieme Publishing Group,
DOI: 10.1055/s-0033-1349787.
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