Chapter contents
Overview
Origin, central course
Intracranial course
Final innervation
Clinical correlation
Unique features
| Cranial Nerve IV - Trochlear Nerve | Page 5 of 7 |
Intracranial course and final innervation
From the cavernous sinus the trochlear nerve enters the orbit through the superior orbital fissure.
CN IV does not pass through the tendinous ring of the extraocular muscles, rather it passes above the ring.
The trochlear nerve then crosses medially along the roof of the orbit above the levator palpebrae and superior rectus muscles to innervate the superior oblique muscle along its proximal one-third:
Figure 4-5. Final innervation of trochlear nerve.
