The trochlear nerve , (lit. pulley-like nerve) also known as the fourth cranial nerve, cranial nerve IV, or CN IV, is a
The … See more

The trochlear nerve provides motor innervation to the superior oblique muscle of the eye, a skeletal muscle; the trochlear nerve thus carries axons of general somatic efferent type.
Each trochl… See more

Injury to the trochlear nerve cause weakness of downward eye movement with consequent vertical diplopia (double vision). The affected eye drifts upward relative to the normal eye, due to the unopposed actions of t… See more