File:Human extraocular muscles 01.jpg

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Human Extraocular Muscles

Cartoon showing attachment of the human 6 extraocular muscles to the eyeball.

Legend About the Muscles
  • IR - inferior rectus
  • SR - superior rectus
  • LR - lateral rectus
  • MR - medial rectus
  • SO - superior oblique
  • IO - inferior oblique
  • Five of the six muscles (inferior rectus, superior rectus, lateral rectus, medial rectus, and superior oblique) originate at a common tendinous ring of fibrous tissue (the Annulus of Zinn).
    • The Annulus of Zinn surrounds the optic nerve, ophthalmic artery, and ophthalmic vein at their entrance through the apex of the orbit.
  • The sixth muscle (inferior oblique) has a separate origin point on the orbital side of the bony maxilla at the anterior inferomedial strut.
Muscle Structure
Each muscle has 2 equally sized layers.
outer orbital layer inserts on a connective tissue (pulley) ring
inner global layer inserts on the eye sclera.


(Text modified from figure legend and paper text)

Reference

<pubmed>22132088</pubmed>| PLoS One.

Citation: Kasprick DS, Kish PE, Junttila TL, Ward LA, Bohnsack BL, et al. (2011) Microanatomy of Adult Zebrafish Extraocular Muscles. PLoS ONE 6(11): e27095. doi:10.1371/journal.pone.0027095

Copyright

© 2011 Kasprick et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Figure 1. doi:10.1371/journal.pone.0027095.g001 Pone.0027095.g001.jpg Text modified from figure legend and paper text.

Cite this page: Hill, M.A. (2024, April 19) Embryology Human extraocular muscles 01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Human_extraocular_muscles_01.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

File history

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Date/TimeThumbnailDimensionsUserComment
current12:04, 8 June 2012Thumbnail for version as of 12:04, 8 June 2012500 × 600 (47 KB)Z8600021 (talk | contribs)==Human Extraocular Muscles== Illustration of human eye showing 6 EOMs inserting on the globe in what is referred to as the Spiral of Tillaux. ===Reference== <pubmed>22132088</pubmed>| [http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone

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