trochlear nerve(redirected from CN IV)
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Related to CN IV: CN VI
1. pertaining to a trochlea.
2. pertaining to the fourth cranial nerve (trochlear nerve).
trochlear nerve the fourth cranial nerve; it supplies muscle sense and the impulse for movement to the superior oblique muscle of the eyeball. See anatomic Table of Nerves in the Appendices.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Either of the fourth pair of cranial nerves that originates in the midbrain and innervates a muscle of the eyeball.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
trochlear nerveThe 4th of the 12 pairs of cranial nerves. The trochlear nerve supplies one of the muscles that moves the eye-the superior oblique muscle. Contraction of this muscle turns the eye downwards and outwards.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
trochlear nervethe fourth cranial nerve on vertebrates, which innervates the superior oblique muscles of the eye.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005