trochlear nerve

trochlear nerve   n.  Either of the fourth pair of cranial nerves that innervate the superior oblique muscles of the eyeballs.

Main Entry: trochlear nerve
Function: noun
: either of the fourth pair of cranial nerves that arise from the dorsal aspect of the brain stem just below the inferiorcolliculus and supply the superior oblique muscle of the eye with motor fibers

trochlear nerve n.
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.