Cranial nerve, fourth
The fourth cranial nerve, the trochlear 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.

Medical dictionary. 2011.

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  • cranial nerve fourth — nervus trochlearis …   Medical dictionary

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  • Fourth cranial nerve — The fourth cranial nerve, the trochlear 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,… …   Medical dictionary

  • cranial nerve — noun any of the 12 paired nerves that originate in the brain stem • Hypernyms: ↑nerve, ↑nervus • Hyponyms: ↑olfactory nerve, ↑nervii olfactorii, ↑first cranial nerve, ↑optic nerve, ↑ …   Useful english dictionary

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  • Nerve, fourth cranial — The fourth cranial nerve, the trochlear 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,… …   Medical dictionary

  • Cranial nerve IV — The fourth cranial nerve, the trochlear 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,… …   Medical dictionary

  • fourth cranial nerve — noun either of the two cranial nerves on either side that control the superior oblique muscles of the eyes • Syn: ↑trochlear, ↑trochlear nerve, ↑trochlearis • Hypernyms: ↑cranial nerve * * * noun or …   Useful english dictionary

  • Nerve, trochlear — The trochlear nerve controls the superior oblique muscle of the eye, one of the extraocular muscles, the muscles that move the eye. Paralysis of the trochlear nerve results in rotation of the eyeball upward and outward (and, therefore, double… …   Medical dictionary

  • fourth nerve — noun see fourth cranial nerve …   Useful english dictionary

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