Fig. 2. 10-μm coronal section of human medial rectus muscle at the level of the pulley showing the orbital layer inserting into the pulley (P). With the Masson's trichrome stain, the smaller orbital layer fibers stain a dark purple, the larger global layer fibers more bright red. Border between the orbital and global layers is denoted by arrowheads. (Micrograph by Sei Yeul Oh, MD, and the author.)