Nerve, trochlear

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 vision). The trochlear nerve is the fourth cranial nerve. (The twelve cranial nerves emerge from or enter the skull 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. It follows the longest course within the skull of any of the cranial nerves.

Medical dictionary. 2011.

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  • Trochlear nerve — Nerve: Trochlear nerve Path of the Trochlear nerve …   Wikipedia

  • Trochlear nerve — Trochlear Troch le*ar, n. [L. trochlea block or pulley.] (Anat.) Shaped like, or resembling, a pulley; pertaining to, or connected with, a trochlea; as, a trochlear articular surface; the trochlear muscle of the eye. [1913 Webster] {Trochlear… …   The Collaborative International Dictionary of English

  • Trochlear — Troch le*ar, n. [L. trochlea block or pulley.] (Anat.) Shaped like, or resembling, a pulley; pertaining to, or connected with, a trochlea; as, a trochlear articular surface; the trochlear muscle of the eye. [1913 Webster] {Trochlear nerve}. See… …   The Collaborative International Dictionary of English

  • trochlear nucleus — n a nucleus situated behind the oculomotor nucleus on the dorsal surface of a medial longitudinal fasciculus near the midline that is the source of the motor fibers of the trochlear nerve * * * nucleus of trochlear nerve n. nervi trochlearis …   Medical dictionary

  • trochlear palsy — trochlear nerve palsy paralysis of the trochlear nerve, with diplopia and pain at the corner of the orbit; many cases are idiopathic, and a few are complications of herpes zoster ophthalmicus. Called also fourth nerve p …   Medical dictionary

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  • Trochlear nucleus — Brain: Trochlear nucleus Outline of the nucleus raphe dorsalis: DRif interfascicular subnucleus, DRv ventral subnucleus DRvl ventrolateral subnucleus DRd dorsal subnucleus mlf medial longitudinal fasciculus Aq cerebral aqueduct IVn trochlear nu …   Wikipedia

  • Trochlear nerve — 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

  • Nerve — A bundle of fibers that uses electrical and chemical signals to transmit sensory and motor information from one body part to another. See nervous system. * * * A whitish cordlike structure composed of one or more bundles (fascicles) of myelinated …   Medical dictionary

  • 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

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