noun
trochlear nerve
Anatomical term for the fourth cranial nerve, which controls the superior oblique muscle of the eye.
滑車神経は上斜筋を支配する。
The trochlear nerve innervates the superior oblique muscle.
From 滑車 (pulley) + 神経 (nerve), referring to the pulley-like structure (trochlea) through which the tendon of the superior oblique muscle passes.