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 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.

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trochlear nerve n either of the fourth pair of cranial nerves that arise from the dorsal aspect of the brain stem just below the inferior colliculus and supply the superior oblique muscle of the eye with motor fibers

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the fourth cranial nerves (IV), which supplies the superior oblique muscle, one of the muscles responsible for movement of the eyeball in its socket. The action of the trochlear nerve is coordinated with that of the oculomotor and the abducens nerve.

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nervus trochlearis.

Medical dictionary. 2011.

Look at other dictionaries:

  • 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 nerve — the fourth cranial nerve (IV), which supplies the superior oblique muscle, one of the muscles responsible for movement of the eyeball in its socket. The action of the trochlear nerve is coordinated with that of the oculomotor and the abducens… …   The new mediacal dictionary

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

  • trochlear nerve — noun Date: circa 1858 either of the fourth pair of cranial nerves that supply some of the eye muscles with motor fibers called also trochlear …   New Collegiate Dictionary

  • trochlear nerve — noun A motor nerve that innervates the superior oblique muscle of the eye …   Wiktionary

  • trochlear nerve — /ˈtrɒkliə nɜv/ (say trokleeuh nerv) noun the fourth cranial nerve in vertebrates …   Australian English dictionary

  • trochlear nerve — Anat. either one of the fourth pair of cranial nerves, consisting of motor fibers that innervate the superior oblique muscle of the upper part of the eyeball. [1885 90] * * * …   Universalium

  • Нерв Блоковой (Trochlear Nerve) — четвертый черепно мозговой двигательный нерв (IV), иннервируюший верхнюю косую мышцу глазного яблока. Действие блокового нерва скоординировано с действием глазодвигательного и отводящего нервов. Источник: Медицинский словарь …   Медицинские термины

  • 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

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