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Related Experiment Videos

Anatomical and functional choroidal lobuli

A W Fryczkowski1

  • 1Ohio State University, Dept. of Ophthalmology, College of Medicine, Columbus 43210-1228.

International Ophthalmology
|January 1, 1994
PubMed
Summary

This study reveals distinct anatomical and functional models of choroidal lobules. The observed lobular patterns in angiography differ from the actual anatomical structure of the choriocapillaris.

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Area of Science:

  • Ophthalmology
  • Vascular Anatomy
  • Microscopy

Background:

  • The choroidal angioarchitecture, specifically the choriocapillaris (CC), is a subject of debate between anatomists and clinicians.
  • Understanding the CC's structure is crucial for diagnosing and treating various ocular conditions.

Purpose of the Study:

  • To resolve the controversy surrounding the choroidal angioarchitecture.
  • To differentiate between anatomical and functional models of choroidal lobules.

Main Methods:

  • Utilized scanning electron microscopy (SEM) on vascular casts from 36 human and 10 Rhesus monkey eyes.
  • Analyzed the patterns and structures of the choriocapillaris from peripapillary to peripheral regions.

Main Results:

  • The choriocapillaris (CC) exhibits non-homogenous patterns varying with location.
  • Anatomical lobules of the CC are not identical to the functional lobules observed in angiographic studies.
  • Collecting venules were found in 86% of anatomical lobules, while feeding arterioles were present in only 14%.

Conclusions:

  • Two distinct models of choroidal lobules—anatomical and functional—should be recognized.
  • The lobular appearance in fluorescein (FA) and indocyanine green (ICG) angiography is likely due to blood flow pressure gradients.
  • SEM analysis provides a clearer understanding of the true choroidal vascular structure.

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