Name: Cranial Nerve IV
Definition: Cranial nerve IV is the trochlear nerve.
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Structure: The trochlear nerve is a motor nerve that supplies the extrinsic, superior oblique muscle of the eye. It connects with the midbrain.
Function: As a motor nerve, the trochlear nerve stimulates contractions in the extrinsic, superior oblique muscle that moves the eye upward, and laterally.

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