A novel map of the mouse eye for orienting retinal topography in anatomical space

Maureen E. Stabio*, Katelyn B. Sondereker, Sean D. Haghgou, Brittany L. Day, Berrien Chidsey, Shai Sabbah, Jordan M. Renna

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Functionally distinct retinal ganglion cells have density and size gradients across the mouse retina, and some degenerative eye diseases follow topographic-specific gradients of cell death. Hence, the anatomical orientation of the retina with respect to the orbit and head is important for understanding the functional anatomy of the retina in both health and disease. However, different research groups use different anatomical landmarks to determine retinal orientation (dorsal, ventral, temporal, nasal poles). Variations in the accuracy and reliability in marking these landmarks during dissection may lead to discrepancies in the identification and reporting of retinal topography. The goal of this study was to compare the accuracy and reliability of the canthus, rectus muscle, and choroid fissure landmarks in reporting retinal orientation. The retinal relieving cut angle made from each landmark during dissection was calculated based on its relationship to the opsin transition zone (OTZ), determined via a custom MATLAB script that aligns retinas from immunostained s-opsin. The choroid fissure and rectus muscle landmarks were the most accurate and reliable, while burn marks using the canthus as a reference were the least. These values were used to build an anatomical map that plots various ocular landmarks in relationship to one another, to the horizontal semicircular canals, to lambda–bregma, and to the earth's horizon. Surprisingly, during normal locomotion, the mouse's opsin gradient and the horizontal semicircular canals make equivalent 6° angles aligning the OTZ near the earth's horizon, a feature which may enhance the mouse's ability to visually navigate through its environment.

Original languageAmerican English
Pages (from-to)1749-1759
Number of pages11
JournalJournal of Comparative Neurology
Volume526
Issue number11
DOIs
StatePublished - 1 Aug 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 Wiley Periodicals, Inc.

Keywords

  • RRID: AB_2158332
  • choroid fissure
  • extraocular muscles
  • eye dissection
  • lambda–bregma
  • mouse
  • opsin
  • retina
  • semicircular canals
  • topography

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