2020–2021 BCSC Basic and Clinical Science Course™
6 Pediatric Ophthalmology and Strabismus
Part I: Strabismus
Chapter 3: Anatomy of the Extraocular Muscles
Origin, Course, Insertion, and Innervation of the Extraocular Muscles
Relationship of the Rectus Muscle Insertions
Starting at the medial rectus and proceeding to the inferior rectus, lateral rectus, and superior rectus muscles, the rectus muscle tendons insert progressively farther from the limbus. Drawing a continuous curve through these insertions yields a spiral, known as the spiral of Tillaux (Fig 3-3). The temporal side of each vertical rectus muscle insertion is farther from the limbus (ie, more posterior) than is the nasal side.
Figure 3-3 Spiral of Tillaux, right eye. Note: The insertion distances, given in millimeters, are maximum values. Insertion distances vary among individuals.
(Illustration by Christine Gralapp.)
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.