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Trochlear nerve
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== Other animals == [[Homology (biology)|Homologous]] trochlear nerves are found in all [[jawed vertebrates]]. The unique features of the trochlear nerve, including its dorsal exit from the brainstem and its contralateral innervation, are seen in the primitive brains of sharks.<ref>Maisey JG. "Morphology of the Braincase in the Broadnose Sevengill Shark ''Notorynchus'' (Elasombranchii, Hexanchiformes), Based on CT Scanning". ''American Museum Novitates'', Number 3429. New York: American Museum of Natural History, 2004</ref>
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