Is the insertional anatomy of rectus extraocular muscles binocularly symmetrical?

Abstract:

PURPOSE:This study was performed to examine the location, width, and insertional shape of rectus extraocular muscles (EOMs), and to elucidate the symmetry of the insertional anatomy of rectus EOMs in the left and right eyes. METHODS:EOMs were dissected from their origin to the insertion point in 100 intact orbits of 50 cadavers. The width, location, and shape of 4 rectus EOMs insertions were measured. The insertional shapes were classified into 6 categories: straight, oblique, convex, oblique-convex, concave, and nonspecific types. RESULTS:The most common types of insertional shapes were superior rectus muscle, oblique type (34%); inferior rectus muscle, oblique type (7%); lateral rectus muscle, concave type (41%); and medial rectus muscle, straight type (37%). The distance from the limbus to insertion and the width of rectus EOMs were almost symmetrical between the left and right eyes of the paired specimens. However, the insertional shapes were different in 46% of the superior rectus, 56% of the inferior rectus, 58% of the lateral rectus, and 46% of the medial rectus muscles. In a given individual, 49 individuals demonstrated asymmetric insertional shapes in at least 1 rectus EOM in both eyes. CONCLUSIONS:Ocular surgeons should consider the possibility of differences in the insertional shape of rectus EOMs between the left and right eyes, especially when performing rectus EOM recession.

journal_name

Ophthalmic Res

journal_title

Ophthalmic research

authors

Cho HK,Shin SY

doi

10.1159/000272021

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

179-84

issue

4

eissn

0030-3747

issn

1423-0259

pii

000272021

journal_volume

43

pub_type

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