On an intracranially divided optic nerve (N. opticus fissus)

Area of Science:

• Neurosurgery
• Neuroanatomy
• Ophthalmology

Background:

• The optic nerve is a critical cranial nerve transmitting visual information.
• Anatomical variations of the optic nerve can impact visual pathways.
• Intracranial adhesions can lead to neurological deficits.

Purpose of the Study:

• To document and describe the first reported case of an intracranially divided optic nerve.
• To analyze the associated arachnoid membrane and medial frontobasal artery adhesion.
• To discuss the implications of this anatomical finding in neurosurgery and neuroanatomy.

Main Methods:

• Detailed neuroanatomical examination of the intracranial optic nerve.
• Intraoperative observation and documentation of the divided optic nerve and adhesion.
• Review of existing literature on optic nerve anomalies and intracranial adhesions.

Main Results:

• First-time description of an intracranially divided optic nerve.
• Identification of an adhesion between the arachnoid membrane and the medial frontobasal artery on the superior surface of the divided optic nerve.
• Comparison with previous anatomical studies and case reports.

Conclusions:

• The intracranially divided optic nerve represents a rare anatomical variation.
• Associated adhesions may have clinical significance in surgical interventions.
• Further research is needed to understand the etiology and clinical impact of this finding.