1) Cranial nerve 2) Fourth cranial nerve 3) Trochlear nerve 4) Trochlearis 1) Trochlearis 
like a pulley
• (n.) Shaped like, or resembling, a pulley; pertaining to, or connected with, a trochlea; as, a trochlear articular surface; the trochlear muscle of the eye.
(trok´le-әr) pertaining to a trochlea. pertaining to the fourth cranial nerve (trochlear nerve).
Type: Term Pronunciation: trok′lē-ăr Definitions: 1. Relating to a trochlea, especially the trochlea of the superior oblique muscle of the eye. Synonyms: trochleiform, trochlearis1
[n] - either of the two cranial nerves on either side that control the superior oblique muscles of the eyes
trochlear In anatomy, relating to a trochlea, or to any other pulley-shaped part or structure.
trochlear nerve noun either of the two cranial nerves on either side that control the superior oblique muscles of the eyes