German Contact Help Login Register

The Trochlear Nerve and The Abducent Nerve

Contents

Anatomy

The Trochlear Nerve is the fourth of the Twelve Cranial Nerves, whereas the Abducent Nerve is the sixth. They both consist of afferent and efferent motoric fibers. The word Afferent means toward the centre, as in from a peripheral area of a limb to the central nervous system. The word Efferent is the opposite of Afferent, meaning away from the centre and toward the periphery; when the stimulus is carried from the brain to a peripheral area.

Cranial nerves
Recommended video: Cranial nerves
Overview of the 12 cranial nerves.

Pathways

The pathway for the efferent fibers of the Trochlear Nerve is the following (from the initiation in the brain to the termination in the periphery):

The pathway for the efferent fibers of the Abducent Nerve is the following (from the initiation in the brain to the termination in the periphery):

  • The Nucleus of the Abducent Nerve can be found in the Facial Colliculus of the Brainstem.
  • It exits the skull via the Superior Orbital Fissure.
  • It innervates the Lateral Rectus muscle of the eye.
  • This nerve governs the muscle responsible for retracting the eye within the orbit.

The pathway for the afferent fibers of both nerves is the following (from the stimulatory cells in the periphery to the final synapse in the brain): exactly the opposite of the efferent pathway, respectively.

Get me the rest of this article for free
Create your account and you’ll be able to see the rest of this article, plus videos and a quiz to help you memorize the information, all for free. You’ll also get access to articles, videos, and quizzes about dozens of other anatomy systems.
Create your free account ➞
Show references

Reference:

  • Frank H. Netter, Atlas der Anatomie, 5th Edition (Bilingual Edition: English and German), Saunders, Kapitel 1, Tafel 113, 115 and 120, Published 2010.

Author:

  • Dr. Alexandra Sierosławska

Illustrators:

  • Trochlear nerve and abducent nerve - Yousun Koh 
© Unless stated otherwise, all content, including illustrations are exclusive property of Kenhub GmbH, and are protected by German and international copyright laws. All rights reserved.

Continue your learning

Article (You are here)
Other articles
Well done!
Create your free account.
Start learning anatomy in less than 60 seconds.