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Updated: Apr 6, 2026

Optic Nerve Transection: A Model of Adult Neuron Apoptosis in the Central Nervous System
Published on: May 12, 2011
Microsurgical anatomy of the trochlear nerve
Wonil Joo1,2, Albert L Rhoton2
1Department of Neurosurgery, Uijeongbu St. Mary's Hospital, the Catholic University of Korea College of Medicine, Seoul, South Korea.
The trochlear nerve (cranial nerve IV) has a long, complex path and is vulnerable during surgery. Understanding its detailed microsurgical anatomy is crucial for safe surgical interventions.
Area of Science:
- Neurosurgery
- Neuroanatomy
Background:
- The trochlear nerve (cranial nerve IV) is the thinnest cranial nerve and has the longest intracranial course.
- It originates from the dorsal brainstem, decussates, and travels anteriorly through the cavernous sinus to the orbit.
Purpose of the Study:
- To describe the microsurgical anatomy of the trochlear nerve.
- To highlight its vulnerability during surgical procedures due to its anatomical course.
Main Methods:
- Review of microsurgical anatomical details of the trochlear nerve.
- Illustration of the nerve and its surrounding neurovascular structures.
Main Results:
- Detailed description of the trochlear nerve's intracranial and intraorbital course.
- Emphasis on its anatomical proximity to surgical landmarks and potential for injury.
Conclusions:
- Precise knowledge of trochlear nerve anatomy is essential for safe surgical approaches.
- Understanding neurovascular relationships aids in managing complex orbital and cranial fossa lesions.
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