Noun
trochlear nerve (plural trochlear nerves)
(neuroanatomy) Each of the fourth pair of cranial nerves that innervate the superior oblique muscle of the eye with motor fibers.
Coordinate terms: olfactory nerve, optic nerve, oculomotor nerve, trigeminal nerve, abducens nerve, facial nerve, vestibulocochlear nerve, glossopharyngeal nerve, vagus nerve, accessory nerve, hypoglossal nerve
Damage to the trochlear nerve (IV) can also cause diplopia with the eye adducted and elevated. Source: Internet
Eye movement (III, IV, VI) Various deviations of the eyes due to abnormal function of the targets of the cranial nerves The oculomotor nerve (III), trochlear nerve (IV) and abducens nerve (VI) coordinate eye movement. Source: Internet