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Related Experiment Videos

The human accessory optic system.

C A Fredericks1, R A Giolli, R H Blanks

  • 1Department of Neurosurgery, USC School of Medicine, Los Angeles 90033.

Brain Research
|June 28, 1988
PubMed
Summary

The accessory optic system (AOS) in humans has been identified using a novel tracing technique. This study reveals direct retinal input to human AOS nuclei, similar to primates.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neuroanatomy

Background:

  • The accessory optic system (AOS) is well-studied in vertebrates but poorly understood in humans.
  • Previous research lacked techniques to anatomically demonstrate human AOS pathways.
  • The functional importance of the human AOS has been historically underestimated by clinicians.

Purpose of the Study:

  • To anatomically demonstrate the retinofugal pathway to the human accessory optic system.
  • To investigate the presence and organization of the human AOS.
  • To compare the human AOS with that of simian primates.

Main Methods:

  • Utilized a modified osmium impregnation method (p-phenylene diamine staining) for tracing degenerated fibers in human and monkey brains.
  • Examined two human autopsy brains and one Cynomolgus monkey brain with prior visual system lesions.
  • Analyzed degenerated axons and preterminal axonal profiles in specific AOS nuclei.

Main Results:

  • Demonstrated direct retinal input to the lateral, dorsal, and interstitial nuclei of the superior fasciculus (LTN, DTN, inSEp) in human brains.
  • Confirmed bilateral but primarily crossed accessory optic projections in both human and monkey brains.
  • Identified similarities between human and simian AOS in nuclear location, number, and retinofugal projection organization.

Conclusions:

  • The human accessory optic system receives direct retinal input.
  • Human and simian AOS share significant anatomical and organizational similarities.
  • This study provides the first anatomical evidence of a retinofugal pathway to the human AOS.

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