2020–2021 BCSC Basic and Clinical Science Course™
2 Fundamentals and Principles of Ophthalmology
Part I: Anatomy
Chapter 1: Orbit and Ocular Adnexa
Extraocular Muscle Distribution in the Orbit
See Figures 1-12 through 1-14 for the arrangement of the extraocular muscles within the orbit. Note the relationship between the oblique extraocular muscles and the superior, medial, and inferior rectus muscles. See Chapter 17 for additional figures depicting the location of the extraocular muscles within the orbit and their relationship to surrounding structures, along with corresponding computed tomography and magnetic resonance imaging scans.
Figure 1-16 The medial rectus tendon is closest to the limbus, and the superior rectus tendon is farthest from it. By connecting the insertions of the tendons beginning with the medial rectus, then the inferior rectus, then the lateral rectus, and finally the superior rectus, a spiral (known as the spiral of Tillaux) is obtained. Measurements are in millimeters. The anterior ciliary arteries are also shown.
(Illustration by Christine Gralapp.)
Excerpted from BCSC 2020-2021 series: Section 2 - Fundamentals and Principles of Ophthalmology. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.