The fourth cranial nerve, the troc hlear nerve,
is the nerve supply to the superior oblique muscle of the eye, one of the muscles
that moves the eye. Paralysis of the trochlear nerve results in rotation of the
eyeball upward and outward (and, therefore, double vision).
The twelve cranial nerves, the trochlear nerve included, emerge from or enter
the skull (the cranium), as opposed to the spinal nerves which emerge from the vertebral
column.
The trochlear nerve is the only cranial nerve that arises from the back of the
brain stem and it follows the longest course within the skull of any of the cranial
nerves.
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