Trochlear Nerve (CN IV)

by Darren Salmi, MD, MS

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    00:01 Cranial nerve IV, or the trochlear nerve is also going to have nuclei back in the midbrain.

    00:08 But it's going to have a strange path, it's going to actually cross over somewhere in the midbrain before it emerges.

    00:16 So it's actually going to have an emergence on the opposite side where its nucleus was.

    00:21 It's also going to open on the posterior aspect of the brainstem unlike these other cranial nerves, so that's going to give it a very long course.

    00:33 It's going to go through the lateral walls of the cavernous sinus as well.

    00:37 And then through the superior orbital fissure, but it's going to go external to that common tenderness ring at the back of the orbit.

    00:45 Before it innervates the superior oblique muscle.

    About the Lecture

    The lecture Trochlear Nerve (CN IV) by Darren Salmi, MD, MS is from the course Neurovasculature of the Head.

    Included Quiz Questions

    1. Posterior brain stem
    2. Anterior brain stem
    3. Lateral brain stem
    4. Superior brain stem
    5. Inferior brain stem

    Author of lecture Trochlear Nerve (CN IV)

     Darren Salmi, MD, MS

    Darren Salmi, MD, MS

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