Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/58652
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Type: Journal article
Title: Overriding of the preseptal orbicularis oculi muscle in Caucasian cadavers
Author: Kakizaki, H.
Chan, W.
Takahashi, Y.
Selva-Nayagam, D.
Citation: Clinical Ophthalmology (online), 2009; 3(1):243-246
Publisher: Dove Medical Press Ltd
Issue Date: 2009
ISSN: 1177-5483
1177-5483
Statement of
Responsibility: 
Hirohiko Kakizaki, Weng Onn Chan, Yasuhiro Takahashi, and Dinesh Selva
Abstract: We aimed to microscopically examine whether Caucasian eyelids demonstrate overriding of preseptal orbicularis oculi muscle (OOM) over the pretarsal OOM in both lower and upper eyelids. Full thickness sections of 13 lower eyelids and 11 upper eyelids from seven Caucasian cadavers were examined. In the lower eyelids, all 13 specimens demonstrated clear overriding of preseptal OOM over the pretarsal OOM. The overriding part extended almost to the level of lower eyelid margin. However, in the upper eyelids, only one of the 11 eyelids demonstrated overriding, and the overriding part only extended to the level of mid-tarsal plate. Our result strongly supports the hypothesis of overriding of the preseptal OOM over the pretarsal OOM as an etiology of involutional lower eyelid entropion. The relatively low frequency of upper eyelid overriding preseptal OOM in our study reflects and may explain the rare occurrence of involutional upper eyelid entropion.
Keywords: Caucasian; overriding; orbicularis oculi muscle; preseptal; pretarsal
Rights: © 2009 Kakizaki et al, publisher and licensee Dove Medical Press Ltd. This is an Open Access article which permits unrestricted noncommercial use, provided the original work is properly cited.
RMID: 0020096456
DOI: 10.2147/OPTH.S4876
Appears in Collections:Opthalmology & Visual Sciences publications

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