The orbital roof is formed from 2 bones (see Fig 1-2):
The fossa for the lacrimal gland, lying anterolaterally behind the zygomatic process of the frontal bone, resides within the orbital roof. Medially, the trochlear fossa is located on the frontal bone approximately 4–5 mm from the orbital margin and is the site of the pulley of the superior oblique muscle, where the trochlea, a curved plate of hyaline cartilage, is attached.
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.