Trochlear nerve topic

The trochlear nerve (the fourth cranial nerve, also called the fourth nerve or simply IV) is a motor nerve (a “somatic efferent” nerve) that innervates a single muscle: the superior oblique muscle of the eye. An older name is pathetic nerve, which refers to the dejected appearance (head bent forward) that is characteristic of patients with fourth nerve palsies. The trochlear nerve is unique among the cranial nerves in several respects. It is the smallest nerve in terms of the number of axons it... full article at wikipedia