trochlear nerve definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Either of the fourth pair of cranial nerves that innervate the superior oblique muscles of the eyeballs.
trochlear nerve - Medical Definition
A nerve that originates in the mesencephalon below the cerebral aqueduct and supplies the superior oblique muscle of the eyeball. Also called fourth cranial nerve.